William and Steven are both anger-excitation rapists incapable of empathy, deriving pleasure from the pain they inflicted on their victims. Unlike most killing teams, which have a dominant and submissive, William and Steven were both dominant personalities and alpha males, which, while rare when it comes to killing duos, is not completely unheard of. Essentially saints in their personal lives, it was the presence of a dark side and feelings of emptiness that drew the two together and made them feel complete. The longer Steven and William get away with their crimes, the stronger their relationship grows, with the two becoming more addicted to rape, torture, murder and each other. Had they not met, the two likely would have continued committing sexual assaults, but may not have escalated to murder.
The duo appear to have been based on Angelo Buono and Kenneth Bianchi - Both teams consisted of ephebophilic serial killers and rapists who shared predator personalities, were psychopathic sexual sadists, had fights that would eventually lead to their incarcerations, and tortured their victims before strangling them.
They may have also been based on Lawrence Bittaker and Roy Norris - Both teams consisted of ephebophilic serial killers, rapists, and abductors, and sexual sadists who targeted women, abducting, raping, and killing them by strangling them. Both also committed crimes prior to killing together. In addition, in both cases, it was initially assumed that only one person was committing the murders.
- November-December 2008:
- Kim Groves (raped by both; killed by William)
- Two unnamed victims (raped by both consecutively; killers unspecified)
- January 10-11, 2009: Missy DeWald (bitten and killed by Baleman; possibly raped by both)