<Ul> <Li> Jonny Lee Miller as Sherlock Holmes: A former Scotland Yard consultant who now lives in New York City after completing drug rehabilitation there for addiction - related problems in the United Kingdom . Holmes is a deductive genius with a variety of unusual interests and enthusiasms that assist him in his investigations . Feeling that the more interesting criminal cases are in America, he stays in New York . He contacts an old associate, Captain Thomas Gregson of the NYPD, to resume his previous work as a consulting detective . He is forced by his father to live with Dr. Joan Watson, his "sober companion" who provides him with aftercare . Miller's Holmes displays many canonical aspects of Sir Arthur Conan Doyle's character, while his familial relations, especially his resentment for his father, have been added into his narrative . In between seasons two and three, Sherlock spent eight months in Britain working for MI - 6 . He returned to New York in "Enough Nemesis to Go Around" with a new protégé, Kitty Winter . At the conclusion of season three, Holmes suffers a relapse, but his father's connections allow him to resume working for the NYPD . In Season 4, it is revealed in mid-season that his mother, May Holmes, was also an opiate addict like him . In the last few episodes of the fifth season, he is shown suffering from unexplained headaches and a lack of concentration, as well as hallucinating a woman who is based on his mother; the sixth season premiere reveals that he is suffering from post-concussion syndrome, requiring him to be put on a carefully balanced system of medication as well as taking on assorted mental activities to try and help his brain heal, albeit hampered by Sherlock's' need' to use his work to escape his past addictions . </Li> <Li> Lucy Liu as Dr. Joan Watson (née Yun): Holmes' sober companion . Watson was a successful surgeon, which adds to her complement of skills . She comes to Holmes when she is hired by his father as his sober companion, to help him remain abstinent after his release from rehabilitation . After her contracted time is finished, she remains on after lying to Holmes, telling him that his father had retained her services . He comes to rely on her input and grows to trust her as she helps him come to terms with his life after addiction . After a while, Holmes reveals that he found out that she was no longer being paid to stay as a companion . He offers her a position as an apprentice, telling her how much she means to him and how she helps him to focus . Watson accepts and starts her training as a detective with Holmes . After Sherlock left for London, Joan became the go - to consulting detective for the 11th Precinct, while also taking on more traditional private investigator - type cases that Sherlock eschews . Despite this, the two resumed working together after Holmes returned to New York, albeit with Joan taking on the occasional independent case away from Holmes . Joan has a brother Oren and a half - sister Lin Wen (née Yun). Joan and her sister have the same father, different mothers . </Li> <Li> Aidan Quinn as Captain Thomas "Tommy" Gregson: The captain of the New York City Police Department's 11th Precinct . He was previously assigned to Scotland Yard to observe their Counter-Terrorism Bureau, where he crossed paths with Sherlock and was impressed with his work . He genuinely likes Holmes, and the two have a mutual respect for each other, though he admits that Sherlock is a "pain in the ass". In season 2, Gregson separated from his wife of over twenty years, Cheryl, and they are divorced by season 3 . In "Rip Off" (season 3, episode 5), it is revealed that his daughter, Hannah (Liza J. Bennett), is an ambitious patrol officer with the 15th Precinct; by season 6, Hannah has been promoted to Sergeant . In "Absconded" (season 3, episode 23), Gregson is offered a promotion to Deputy Chief due to the good work of his unit, but despite hints that some higher - ups wanted him to accept the offer, he decided to remain as he valued his current role and ability to interact with people more than the possibilities offered by the promotion . It is also mentioned in that episode that he served at the 14th Precinct as a newly promoted Detective and was made head of the Major Case Squad at age 40 . In Season Four, it is revealed mid-season that Gregson is now dating Paige Cowen, a former detective who quit after her unit was accused of taking bribes; they briefly break up after Joan runs into them at a restaurant, as Paige claims she doesn't want people to think ill of Gregson even if she wasn't involved in her unit's actions, but Joan soon learns that Paige actually has multiple sclerosis, and convinces Gregson to give the relationship another chance . He is a recipient of the U.S. Flag Bar, World Trade Center Bar, NYPD Medal of Honor, NYPD Medal for Valor, and the NYPD 170th Commemorative Breast Bar . </Li> <Li> Jon Michael Hill as Detective First Grade Marcus Bell: A junior officer with the 11th Precinct with whom Holmes and Watson often work . While initially against the idea of getting help from Sherlock, he comes to realize Sherlock's talent as a detective and readily takes advice from him . He was briefly reassigned to an observational role in Season Two after sustaining a potentially serious shoulder injury due to a hostile witness Holmes had questioned earlier, but a confrontation with Holmes helped Bell get over the psychological issues that were hindering his recovery and he has since returned to his old role . In season 4, Marcus considers taking the Sergeant's exam, not necessarily for the work or to rise up the ranks of the NYPD, but for the increase in paycheck to help support his ailing mother . In season 6, Marcus is headhunted by the United States Marshals Service and he decides to put in an application for transfer upon completing his Master's degree in six months . He is a recipient of the U.S. Flag Bar, NYPD Excellent Police Duty, and the NYPD 170th Commemorative Breast Bar . </Li> <Li> John Noble as Morland Holmes (season 4; guest, season 6): Sherlock's father who arrives in New York after Sherlock has a relapse . He works as an eminent business consultant, making arrangements for various companies to achieve their goals regardless of what they might be with Sherlock describing him as a' neutral' party in that he has no concern about the consequences of his clients' goals so long as they are achieved . He has decided to stay in New York for unknown long - term reasons involving Sherlock, with Joan speculating from independent research that he suffered serious stomach damage in a failed attempt to murder him two years ago, and may believe that he is being targeted again . With a view to resolving the threat, at the end of Season 4, he takes over the leadership of Moriarty's organization which will help him to dismantle the group and guarantee safety of his son from further harm . </Li> <Li> Nelsan Ellis as Shinwell Johnson (season 5): A previous patient of Dr. Watson and an ex-convict and gang member for the SBK (South Bronx Killas). He and Watson became acquainted once more when he was released from prison and was placed on probation . During his time on probation, Watson helped him settle back into his life outside of prison while also assisting him in his attempt to build a relationship with his daughter . He was briefly an unofficial informant for an FBI agent and is now an official informant for the Bronx Gang Squad . His relationship with Sherlock and Joan faltered when Sherlock discovered that Shinwell was responsible for the death of a friend of his during his original time in SBK, but Shinwell wrote a confession for this crime as he was preparing to bring down the gang, only to be killed by another member of SBK . </Li> <Li> Desmond Harrington as Michael Rowan (season 6): A recovering addict who becomes impressed with Sherlock's methods of dealing with his addiction and becomes his friend and leaning post as he tackles a staggering health issue . He is later revealed to be a murderer after burying a woman's body in an unknown location; eventually, he is revealed as a serial killer, who has killed an estimate of about a dozen women in multiple states, and has credited Sherlock with convincing him to focus on his "work" (a.k.a. killing) in order to kick his heroin addiction . </Li> </Ul> <Li> Jonny Lee Miller as Sherlock Holmes: A former Scotland Yard consultant who now lives in New York City after completing drug rehabilitation there for addiction - related problems in the United Kingdom . Holmes is a deductive genius with a variety of unusual interests and enthusiasms that assist him in his investigations . Feeling that the more interesting criminal cases are in America, he stays in New York . He contacts an old associate, Captain Thomas Gregson of the NYPD, to resume his previous work as a consulting detective . He is forced by his father to live with Dr. Joan Watson, his "sober companion" who provides him with aftercare . Miller's Holmes displays many canonical aspects of Sir Arthur Conan Doyle's character, while his familial relations, especially his resentment for his father, have been added into his narrative . In between seasons two and three, Sherlock spent eight months in Britain working for MI - 6 . He returned to New York in "Enough Nemesis to Go Around" with a new protégé, Kitty Winter . At the conclusion of season three, Holmes suffers a relapse, but his father's connections allow him to resume working for the NYPD . In Season 4, it is revealed in mid-season that his mother, May Holmes, was also an opiate addict like him . In the last few episodes of the fifth season, he is shown suffering from unexplained headaches and a lack of concentration, as well as hallucinating a woman who is based on his mother; the sixth season premiere reveals that he is suffering from post-concussion syndrome, requiring him to be put on a carefully balanced system of medication as well as taking on assorted mental activities to try and help his brain heal, albeit hampered by Sherlock's' need' to use his work to escape his past addictions . </Li> <Li> Lucy Liu as Dr. Joan Watson (née Yun): Holmes' sober companion . Watson was a successful surgeon, which adds to her complement of skills . She comes to Holmes when she is hired by his father as his sober companion, to help him remain abstinent after his release from rehabilitation . After her contracted time is finished, she remains on after lying to Holmes, telling him that his father had retained her services . He comes to rely on her input and grows to trust her as she helps him come to terms with his life after addiction . After a while, Holmes reveals that he found out that she was no longer being paid to stay as a companion . He offers her a position as an apprentice, telling her how much she means to him and how she helps him to focus . Watson accepts and starts her training as a detective with Holmes . After Sherlock left for London, Joan became the go - to consulting detective for the 11th Precinct, while also taking on more traditional private investigator - type cases that Sherlock eschews . Despite this, the two resumed working together after Holmes returned to New York, albeit with Joan taking on the occasional independent case away from Holmes . Joan has a brother Oren and a half - sister Lin Wen (née Yun). Joan and her sister have the same father, different mothers . </Li> <Li> Aidan Quinn as Captain Thomas "Tommy" Gregson: The captain of the New York City Police Department's 11th Precinct . He was previously assigned to Scotland Yard to observe their Counter-Terrorism Bureau, where he crossed paths with Sherlock and was impressed with his work . He genuinely likes Holmes, and the two have a mutual respect for each other, though he admits that Sherlock is a "pain in the ass". In season 2, Gregson separated from his wife of over twenty years, Cheryl, and they are divorced by season 3 . In "Rip Off" (season 3, episode 5), it is revealed that his daughter, Hannah (Liza J. Bennett), is an ambitious patrol officer with the 15th Precinct; by season 6, Hannah has been promoted to Sergeant . In "Absconded" (season 3, episode 23), Gregson is offered a promotion to Deputy Chief due to the good work of his unit, but despite hints that some higher - ups wanted him to accept the offer, he decided to remain as he valued his current role and ability to interact with people more than the possibilities offered by the promotion . It is also mentioned in that episode that he served at the 14th Precinct as a newly promoted Detective and was made head of the Major Case Squad at age 40 . In Season Four, it is revealed mid-season that Gregson is now dating Paige Cowen, a former detective who quit after her unit was accused of taking bribes; they briefly break up after Joan runs into them at a restaurant, as Paige claims she doesn't want people to think ill of Gregson even if she wasn't involved in her unit's actions, but Joan soon learns that Paige actually has multiple sclerosis, and convinces Gregson to give the relationship another chance . He is a recipient of the U.S. Flag Bar, World Trade Center Bar, NYPD Medal of Honor, NYPD Medal for Valor, and the NYPD 170th Commemorative Breast Bar . </Li>

Why was elementary off the air for so long