Eric Lange as Det. Parker, a Lynnwood Police Department detective in Lynnwood, Washington who is assigned to Marie's case; inspired by Sergeant Jeffrey Mason Bill Fagerbakke as Det. Pruitt, a Lynnwood Police Department detective also assigned to Marie's case; inspired by Jerry Rittgarn Elizabeth Marvel as Judith, Marie's most recent foster mom Bridget Everett as Colleen Doggett, one of Marie's former foster moms Danielle Macdonald as Amber, a victim of sexual assault Dale Dickey as RoseMarie, a veteran detective at the Westminster Police Department Liza Lapira as Mia, a police surveillance expert Omar Maskati as Elias, RoseMarie's data analyst intern at the Westminster Police Department Austin Hébert as Max Duvall, Karen's husband who is a police officer at the Westminster Police Department Kai Lennox as Steve Rasmussen, Grace's husband who is an investigator with the Attorney General's office in Westminster, Colorado Blake Ellis as Chris McCarthy, a serial rapist; inspired by Marc Patrick O'Leary Aaron Staton as Curtis McCarthy, Chris's brother and a suspect; inspired by Michael O'Leary Patricia Fa'asua as Becca, a counselor at the Oakdale Apartments for at-risk youth Charlie McDermott as Ty, a counselor at the Oakdale Apartments for at-risk youth Brent Sexton as Al, Colleen's husband and Marie's former foster father Annaleigh Ashford as Lilly, a victim of sexual assault Scott Lawrence as Billy Taggart, an FBI special agent Shane Paul McGhie as Connor, Marie's ex-boyfriend