Actor Patton Oswalt and wife, Michelle McNamara, who died in 2016.

True-crime writer Michelle McNamara didn't live to see April 25, 2018, the day police arrested a suspect in the decades-old investigation into the Golden State Killer, a serial murder-rape case she obsessed over in her book I'll Be Gone in the Dark: One Woman's Obsessive Search for the Golden State Killer.

But her husband and greatest cheerleader, Emmy-winning actor/comedian Patton Oswalt, who saw her book through to completion and publication in February, did.