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William Harris is a serial killer/rapist that appears in Season Four of Criminal Minds. He is one half of a killing team that also includes Stephen Baleman.

Background
William Harris was a high-powered attorney. He was previously charged with rape and abduction in Atlanta, but the victims had refused to testify. He claims to have moved to Florida to escape the stigma that had been placed on him and his family. Soon after arriving, William and his family participated in a neighborhood block party, where William met Stephen Baleman. Through careful suggestion and innuendo, the two realized that they shared the same predatory personality. They would soon begin their mutual killing spree.

Soul Mates
William is first seen giving his daughter, Andrea, a driving lesson. When he is interrupted by a page, he tells her that he has to go. Andrea is upset, but William reassures her by stating he plans on giving her the car for her birthday. As they exit, another neighborhood girl approaches, showing them a "missing" poster featuring the photo of a girl named Missy Dewald. Shortly after, local police and one Detective Linden pull up and confront Harris. He is told that is being arrested for the abduction of Missy DeWald and three other teenage girls. The BAU is awaiting the officers when they arrive at the local PD.

At the police station, Rossi explains that Harris matches the profile of their Unsub: a successful family man who lives and works in the area. The probable cause for the arrest was there - they just don't have the evidence they need to prosecute the man. Now they must dig through all areas of his life while Morgan and Rossi handle the interrogation. Another positive aspect of the arrest is this: the unsub holds his victim for 48 hours before killing her, and Missy was just abducted yesterday. As long as they hold Harris he won't be able to finish her off. Harris points out that by the time the authorities realize he is telling the truth, Missy could be dead.

Reid gets into Harris' computer, with Garcia on a remote connection. Garcia says that Harris has covered his tracks well, but she can follow them. After hacking awhile, Garcia finds text messages to and from another individual that appear to be correspondence between a pair of lovers. Reid realizes that the messages are only coded to appear that way, and that the collaboration may be between a team of abductor/killers.

Back at the PD, Rossi tells William that they have found the messages and demands to know where Missy is. William says nothing. Then, Det. Linden bursts into the room, telling the group that Missy's body has been found. William smiles, saying, "I told you so." (referring to his earlier statement).

Profile
William was feeling incomplete - he didn't begin killing until he met his 'soul mate.' The longer the two got away with their crimes, the stronger their relationship grew. They are not just addicted to rape and murder, these two are addicted to each other. Linden and the other agents arrive, and the group discusses the dynamics of these two men - Harris is dominant, self-confident, and the other is willing to be led.