He was arrested in September 2018 as a suspect in a series of more than ten rapes and kidnappings committed between 1991 and 2006 in six Northern California counties (the NorCal Rapist).

DNA evidence from crime scenes were matched on the online DNA-matching service, GEDmatch, to a relative of Waller, and he was identified through genetics-based genealogy.

[7] He was charged with dozens of counts of rape, which took place in five different counties, including Sonoma, Solano, Contra Costa, Yolo and Butte.

[8] At the time of his arrest he was living in Benicia, was married, and was employed as a safety specialist at the University of California Berkeley.

[16][17] His trial began on October 19, and on November 18, Waller was convicted of 46 counts of rape, sodomy and kidnapping involving nine victims.