<Ul> <Li> Lucas Gottesman (Brendan Robinson) (seasons 1--3, 5--7) was an unpopular student at Rosewood, who harbored an unrequited crush on Hanna, with whom he developed a friendship with . Having been frequently tormented by Alison, he often expressed his happiness at her death, going so far as to destroy Alison's memorial, believing her cruelty shouldn't have been forgiven posthumously . Although initially angered by Hanna's rejection of his romantic feelings, he eventually accepts it and even befriends Caleb . He seeks Hanna out for dating advice after he becomes involved with a girl named Danielle, however, it is unclear if any relationship developed between them . Soon afterward, due to a series of misunderstandings and coincidences, the Liars suspect Lucas may be "A" 's helper . It is later revealed that Lucas had gambled away thousands of dollars of Caleb's savings . Following this, his friendship with Hanna and Caleb is severely strained, and Lucas grew increasingly more troubled . It was revealed in the third season that he had been visiting Mona at Radley, because she had discovered he was selling test answers and was blackmailing him into working on the A-Team as her personal assistant . He moved away at the end of season 3, out of fear and as a way to start over . Mona soon reveals to the Liars that it was he who gave Emily the massage as "A". He returns to Rosewood in season 5 and begins helping Mona to take down Alison . After Mona's supposed death, Lucas begins helping the girls to stop Alison, who they believe killed Mona . Lucas is not seen after this but is revealed to have attended prom with Jenna Marshall . </Li> <Li> Gabriel Holbrook (Sean Faris) (seasons 4--5) is a Pennsylvania State Police Officer and the detective assigned to Darren Wilden's murder case . </Li> </Ul> <Li> Lucas Gottesman (Brendan Robinson) (seasons 1--3, 5--7) was an unpopular student at Rosewood, who harbored an unrequited crush on Hanna, with whom he developed a friendship with . Having been frequently tormented by Alison, he often expressed his happiness at her death, going so far as to destroy Alison's memorial, believing her cruelty shouldn't have been forgiven posthumously . Although initially angered by Hanna's rejection of his romantic feelings, he eventually accepts it and even befriends Caleb . He seeks Hanna out for dating advice after he becomes involved with a girl named Danielle, however, it is unclear if any relationship developed between them . Soon afterward, due to a series of misunderstandings and coincidences, the Liars suspect Lucas may be "A" 's helper . It is later revealed that Lucas had gambled away thousands of dollars of Caleb's savings . Following this, his friendship with Hanna and Caleb is severely strained, and Lucas grew increasingly more troubled . It was revealed in the third season that he had been visiting Mona at Radley, because she had discovered he was selling test answers and was blackmailing him into working on the A-Team as her personal assistant . He moved away at the end of season 3, out of fear and as a way to start over . Mona soon reveals to the Liars that it was he who gave Emily the massage as "A". He returns to Rosewood in season 5 and begins helping Mona to take down Alison . After Mona's supposed death, Lucas begins helping the girls to stop Alison, who they believe killed Mona . Lucas is not seen after this but is revealed to have attended prom with Jenna Marshall . </Li> <Li> Gabriel Holbrook (Sean Faris) (seasons 4--5) is a Pennsylvania State Police Officer and the detective assigned to Darren Wilden's murder case . </Li> <Ul> <Li> Sean Ackard (Chuck Hittinger) (season 1) was Hanna's boyfriend prior to the beginning of the series . Having crushed on Sean since before Alison's disappearance, motivated by insecurities about her weight, Hanna puts a lot of pressure on their relationship . When Sean refuses to have sex with Hanna, she becomes upset and wrecks his car, though Sean understands and forgives her . However, the mystery surrounding "A" and Alison's death begin to take a toll on their relationship and that, combined with Sean's treatment of Lucas as well as his attraction to Aria, leads to their breakup . Afterwards, Sean seeks out Emily's help in pursuing Paige, unaware that Paige is a lesbian . </Li> <Li> Caleb Rivers (Tyler Blackburn) (seasons 1--present) is a Rosewood's resident "bad boy" who Hanna seeks out for help in hacking Emily's phone so that she can call Maya, her girlfriend at the time . Though initially annoyed and frustrated by Caleb, she becomes more sympathetic towards him when she discovers his poor home life as he is in foster care . The two eventually enter into a relationship . When she discovers that Caleb originally tried to get close to her while working for Jenna, she dumps him, feeling betrayed . He is brought back to Rosewood by Lucas, who wants Hanna and Caleb to make amends and reunite . After Caleb is contacted by his birth mother, he leaves Hanna to stay in California for a while . He returns in time for Tom's marriage to Isabel, accompanying Hanna to the wedding . Caleb then comes back after being in California and helps Hanna and her friends hack "A" 's phone without telling him whom the phone belongs to, but it backfires when "A" shuts the phone down . His surprise birthday party later gets ruined because Lucas has something to tell Hanna but Hanna takes it the wrong way and they both end up falling out the boat . The Liars (excluding Hanna) let Caleb continue to hack "A" 's phone and so that he does it they tell him about "A". The girls try to hide the truth from Hanna but when she finds out she is angry at them but reconciles with them a while later . Meanwhile, Caleb becomes obsessed with finding out who "A" is, which causes "A" to hack into Caleb's computer and plant secure school files, which lands him in trouble with the police . However, Hanna saves him by deleting the files . Caleb is the first person other than the Liars to help figure out who "A" is . Earlier, Lucas has some problems and starts to be a bad boy at school; when he is given a letter to give to his parents he drops it into a bin and sets it on fire . Hanna starts to worry about Lucas so she asks Caleb to talk to him . Later Caleb confronts Lucas and asks him why he nearly set fire to his girlfriend and why he is he acting so strange; Lucas says sorry and walks off leaving Caleb wondering . In the third season, Hanna has trouble telling Caleb about what is going on in her life, causing him to break up with her . A couple episodes later it is revealed that they are back together in secret, unable to tell anyone . Caleb promises to help Hanna take down this new "A". In the summer finale, he accompanies the Liars to Ali's grave . Right after Emily's confrontation with Nate / Lyndon, he comforts Emily but is shot by the gun that Caleb put down beside the tower light assuming Nate was dead . He survives the gunshot . After some prodding, Hanna convinces him to meet with his actual father who was portraying himself as "Uncle Jamie". They hit it off and Hanna manages to get Caleb's father a job at the church so that he could be near his son . It is hinted that he (Caleb's father) stole money from the church as Hanna notices a bill in his wallet with the same red dice as the one she had donated earlier that day . When he returned the church's bell from repair, it turned out to be a much cheaper version . Hanna tells Caleb about this causing Caleb to break off his new relationship with his father, only for "A" to later reveal it was all a set - up . When Hanna's mom gets framed for Wilden's murder, Caleb teams up with Toby to search for other suspects . He then soon breaks up with Hanna when he's preparing to leave Rosewood to live in his new life in Ravenswood . He returns to Rosewood in season five . </Li> <Li> Travis Hobbs (Luke Kleintank) (seasons 4--5) first appears giving Hanna money in order to help her mother . Hanna then finds out that Travis was a witness to the confrontation between Hanna's mother and Wilden that landed her mother in jail . Two develop a friendship . After Hanna and Caleb break up, Hanna kisses Travis . </Li> <Li> Jordan Hobart (David Coussins) (season 6--present) is Hanna's fiancé after the time jump . He is described as a sophisticated - yet - approachable 27 - year - old working in the fashion industry . </Li> </Ul>

Who plays the police officer in pretty little liars