<Li> Melissa Hastings (Torrey DeVitto) (seasons 1--present) is Spencer's older sister, who was engaged to Wren at the start of the series, but later returns to Ian . A perfectionist and the favored daughter, she was Spencer's rival for most of their lives . Their competition led to Spencer kissing both Ian and Wren, which culminated in Melissa breaking off her engagement with Wren . After their breakup, Melissa rekindled her relationship with Ian and the two eloped; after which Melissa confided in Spencer that she just wanted the fighting between them to stop . Shortly after marrying Ian, Melissa becomes pregnant, which again causes a rift between her and Spencer, who suspects Melissa is covering for Ian . When Ian goes missing, Melissa refuses to believe Spencer's claims that he is dead, thinking that she is receiving text messages from Ian, who is in hiding . After the discovery of Ian's body, Melissa becomes depressed and apologizes to Spencer for choosing Ian over her . When Melissa finds Ian's phone in Spencer's bag, (although "A" put the phone in there), she believes it was Spencer sending the texts to her phone and vows she will never forgive Spencer for this . Melissa discovers that Jason is their half - brother and says that she can't be around their parents because they lied to her and Spencer . She still loiters around the house and Spencer and her friends begin to suspect that Melissa knows more about "A" and Ali's disappearance than she is letting on . They find a video taken inside Alison's room the night she disappeared, and Melissa is shown throwing open the door and yelling "where is she?!" The Liars also find out that Melissa was sending Ali threatening text messages, and had worked at a law firm that Ali had suspected of assisting "A" in messing with her life . Spencer and Melissa's father's gun goes missing, and Spencer fears Melissa took it . Even though Melissa didn't take the gun, her parents still feared that she killed Alison through jealousy, so her mother hired a private investigator to watch her . Toward the end of the second season, Melissa makes some odd statements that implies she knows some secrets about Alison and / or the N.A.T. club . Melissa lost her baby after Ian died . In the third - season finale it is revealed that Melissa is working with Jenna and Shana . In the fourth - season premiere it is revealed that she was the Queen of Hearts that drugged Aria on the Halloween train and put her in a box, along with Wilden . Spencer mentions to Melissa that Wilden was blackmailing her to do so, but Melissa never confirms this suspicion . In the fifth season, it is revealed that Melissa is Bethany Young's killer . She saw Spencer carrying a shovel and then found Bethany's body . She wouldn't look her in the face and assumed that it was Alison whom she thought Spencer had killed . She pushed Bethany into the ground and buried her, unaware that she was still alive, therefore killing her . After telling this to Spencer, Melissa flies back to England and it is revealed that she and Wren are seeing each other again . </Li> <Li> Peter Hastings (Nolan North) (seasons 1--present) is the biological father to Spencer, Melissa, and Jason DiLaurentis . A lawyer who places a great emphasis on winning, he destroys evidence that he fears will indicate Spencer's involvement in Alison's murder . Initially he disapproves of Spencer and Toby dating, he warns Toby after her begins to work for him . Peter strongly dislikes the DiLaurentis family, who he claims are "always crossing lines". In Season 2, Episode 19, it is revealed that Peter did have an affair with Jessica DiLaurentis, that he is Jason's father and that Jason, Spencer and Melissa are all half - siblings . He paid a private investigator to look into Ali's disappearance, as he was afraid that Melissa had something to do with it since he found out Melissa had been sending Ali threatening text messages . </Li> <Li> Veronica Hastings (Lesley Fera) (seasons 1--present) is Spencer's and Melissa's mother . She had a breast cancer scare that she kept a secret from her family, not wanting to worry them . A lawyer, she frequently helps the girls out with legal situations . She dislikes Toby and his relationship with Spencer in the beginning, but she eventually becomes more tolerant of it . In Season 3, she defends Garrett after he gets arrested and eventually gets the judge to allow him to walk free . </Li> <Ul> <Li> Andrew Campbell (Brandon W. Jones) (seasons 3--6) is a secretary of the Decathlon team of which Spencer is a member . He and the rest of the team vote to remove Spencer from the team following her losing to Mona in a quiz - off, resulting in her not appearing at practices . Spencer challenged him to a strip version of quiz - off in order to get his vote to keep her on the team . In season five, he starts dating Aria, after he had been tutoring her . Later on the season Andrew becomes dark and shady, leading the Liars to assume that he is in fact "A". This however, turns out to be false after he was apprehended by police and released due to evidence proving he isn't . He does however, have a twisted fascination with the Liars for undisclosed reasons . </Li> <Li> Eddie Lamb (Reggie Austin) (seasons 3--5) is a nurse at Radley Sanitarium . Toby used his name as his alias while he was working with Mona . </Li> </Ul>

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