"The Sacramento County District Attorney's Office plans to make a 'major announcement" Wednesday, April 25, 2018, in the case of the elusive serial killer.
The suspected Golden State Killer became less prolific but deadlier after losing his job as a police officer.
So what sparked the sudden interest in McNamara's tale of the Golden State Killer?
This undated law enforcement photo provided by the Sacramento County, Calif., Sheriff's Office shows Joseph James DeAngelo.
The killer had committed a series of unsolved 50 rapes and 12 murders throughout California in the 1970s and '80.
LOS ANGELES - "You did it, Michelle".
At the end of his thread of tweets about the twist in the final story McNamara documented, Oswalt wrote sweet words to his new wife.
Reacting to the news of DeAngelo's arrest, Haynes said he is "exhilarated", even though the name was not on any of the lists of suspects he drew up.
"It was pretty awesome", Sarah Stanard, a longtime friend of McNamara's, told The Washington Post. Like they did for Kenneth Hicks 30 years after he killed Lori Billingsley in Aloha, Oregon.
Oswalt appeared on "Late Night with Seth Meyers" Wednesday night to discuss DeAngelo's arrest and his former wife's investigation. I want to know that he's in jail and now he's caught.' The bracelets are on and it feels like this thing that she wanted so badly is now done.
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News that police had arrested a suspect in the decades-old "East Area Rapist" case gave Betsy Reamer a nightmare about the time in 1979 when she thinks she may have seen him.
"And the answer is no", he said.
Though he was too "neck deep in grief" and dealing with the realities of suddenly becoming a single father to be actively involved, Oswalt says he leaned on her publisher and other collaborators to get the book done. "She would be beyond excited about this", he wrote online in a follow-up message.
The prescription medication she was taking for the stress and anxiety likely contributed to her death at 46, he said. Her husband, actor Patton Oswalt, finished her project with the help of lead case researcher Paul Haynes and investigative journalist Billy Jensen.
"Just the fact that they said the book didn't help but then said 'We've got the Golden State Killer, ' it's a bit contradictory", Jensen said. There's all of this new evidence.
Oswalt told the crowd that he believed the killer would be caught soon, that his time was running out.
During a press conference about the case, police credited DNA evidence and the public's interest in the case for the arrest, but they stopped short of naming Michelle McNamara's book. "There were insights and angles that she could keep bringing to this case". Jones said it had not. "It looked as though he might have been searching his mind to execute a particular plan he may have had in mind ... but he was not given the opportunity".
By sheer coincidence, the trio gathered in IL on Tuesday night to celebrate the book, just hours before DeAngelo was taken into custody. In the book, in a haunting passage titled "Letter to an Old Man", McNamara addresses the killer directly under the assumption that he would someday be found.
This is how it ends for you.
It was released as I'll Be Gone In The Dark in February. "Walk into the light".