David Lively

David Lively is the brother of Emma. He used to live in Ridgecrest, where he was best friends with Tom Matthews, before moving to Pleasantview City. He is revealed to be one of the killers in ''The Stalker 2. ''

Background
David grew up in Ridgecrest and was good friends with Katie Barclay. He was best friends with Tom, and the pair of them became infatuated with Katie. They would follow her, take photographs of her and even broke into her house to see her bedroom, although Katie was unaware of this.They grew increasingly frustrated by Katie, as she did not return, or even notice their affections. David eventually had to move to Pleasantview City with his sister. After the events of The Stalker 1, David and Emma were approached by Richard Barclay - who was believed to be dead - and Officer Harris. Richard convinced Emma and David to help them formulate a new plan to kill Katie. David agreed to it, as he resented Katie for ignoring him and also blamed her and Adam Yates for Tom's death (although it was actually Richard who killed it - it can be assumed that Richard lied to David about this to get David to agree to the plan).

When Katie came to live in Pleasantview, David and Emma supported her, pretending to be her friends. David and Emma kept up the masquerade for two years. David became acquainted with Julie and took her as his accomplice. He and Emma decided that she would pretend to be another victim,and that should he fail to kill Katie, Emma would try again in a few years.

The Stalker 2
David, along with Julie, terrorize the apartment block where he lives, committing several murders. David even kills his own cousin, Christie Cooper and her friend Mia Roberts. He is comforted by Katie after she finds him crying - it is unclear as to whether David truly regretted killing Christie, or if he was merely acting. After being barred from Christie's funeral, David and his sister went out to have their own memorial service for her (it is debatable that this was really what they were doing, given that David and Emma had presumably plotted together to kill her). When they returned, David pretended to have be killed by the Stalker and donned the costume himself. He was injured during an ensuing fight with Katie and Adam, but succeeded in subduing them. He injured Katie, knocked Adam out cold and also (non-fatally) stabbed Emma and tied her to a chair, presumably to keep up the charade of Emma having nothing to do with the crimes.

When Katie came to, David took off his mask and revealed himself to her. When Katie demanded an explanation, David told her about his infatuation with her and his desire for revenge for Tom's death. He also revealed that Julie was in on the plan. When Katie ran off, David sent Julie after her. Katie succeeded in killing Julie and came back to face David. He tried to shoot Katie, but at the last moment, Adam regained consciousness and threw himself in the way, taking the bullet instead. Katie then shot David twice before he could try again, killing him.

The Stalker 5
Katie mentions to Lori Yates that shortly after moving to Pleasantview, she was attacked by a mugger in the street one night - in hindsight, she believes that either David or his sister was actually the 'mugger'. The attack caused her to miscarry the baby she was carrying at the time, conceived during her sexual encounter with Adam during The Stalker 1.