Shaun Runyon allegedly beat one victim to death while he slept, and another was found dead on the home's porch. A third died in hospital on Saturday evening.
The University of Michigan Police Department, with the assistance of the FBI, has identified an out-of-state residence from which the threat was posted.
USC ordered the woman and her family to delete all photos and videos of Puliafito doing drugs as part of a settlement. The trove also included sexual footage.
The singer was convicted Monday in a sex trafficking trial after decades of avoiding criminal responsibility for numerous allegations of misconduct with young women and children.
The suspect told police that his wife and her male companion were "egging him on" as they FaceTimed him while having sex in the parking lot of a Pennsylvania hotel.
Adam Oakes, a 19-year-old freshman at the Virginia Commonwealth University, died after being forced to drink alcohol at a frat party in March this year.