<P> In the season, the bodies of Dexter's victims are uncovered and an investigation is launched in Dexter's own department to find the killer, dubbed the "Bay Harbor Butcher". During this time, Debra struggles to recover after surviving the Ice Truck Killer's attempts to murder her, and Rita sends Dexter to Narcotics Anonymous meetings when she suspects that he has an addiction . Sergeant James Doakes (Erik King), stalks Dexter, suspecting that he is connected with the "Ice Truck Killer" killings . Three new characters are introduced: Keith Carradine appears as Special Agent Frank Lundy, an FBI agent who heads the "Bay Harbor Butcher" investigation, JoBeth Williams as Rita's mother Gail, and Jaime Murray as Lila Tournay, Dexter's Narcotics Anonymous sponsor . </P> <P> Starting with this season, the show no longer adapts the Dexter novels . Taking place a month after the first season finale, Dexter has been unable to kill anyone due to Sgt . James Doakes monitoring his activities and his sister Debra now living with him as she recovers from her traumatic experiences concerning Brian, the Ice Truck Killer . Dexter also realizes that he's having trouble killing even when he has the opportunity, due to feelings of guilt over killing his brother Brian . </P> <P> Rita doubts Dexter's reliability and honesty after finding evidence that he set up her husband Paul to be returned to prison . After her husband dies in a prison fight, Rita confronts Dexter with her suspicions . He admits to setting up Paul but can't fully explain how he knew to stage convincing evidence that the man was using heroin . Rita incorrectly concludes that Dexter is, like Paul, a drug addict and that this explains his occasional absences and odd behavior . Dexter decides to falsely admit that this is the case and promises to seek help by joining Narcotics Anonymous . There, he meets Lila Tournay, who offers to be his sponsor . Sgt . James Doakes remains suspicious of Dexter's true motives, and constantly monitors Dexter's whereabouts . </P> <P> Divers accidentally stumble upon Dexter's underwater burial ground, discovering the many bags containing the body parts of his victims . Realizing this dumping ground is the work of a serial killer, the media dubs these bodies the work of the "Bay Harbor Butcher ." When it's revealed that each victim was a criminal and killer, some members of the public openly support the Bay Harbor Butcher; the case even inspires the creation of a knife - wielding comic book superhero "The Dark Defender ." To oversee the investigation of the Butcher's crimes, an FBI special team is assigned to Miami, led by FBI Special Agent Lundy . Working with Miami Metro PD, Lundy brings in several of the Miami detectives, including Debra, to join his team . Over time, Debra and Lundy become romantically involved . </P>

How did rita's husband die in dexter