McNamara spent almost 10 years investigating and writing about the killer, also known as the East Area Rapist and the Original Night Stalker, on her blog TrueCrimeDiary.com and for the manuscript to the book, "I'll Be Gone in the Dark". The Golden State Killer is someone who authorities believe could be responsible for 12 murders and 45 rapes in California between 1976 and 1986.
Oswalt, 49, knew it would have been a big day for his late wife - and said the celebration surrounding the long-awaited arrest was "the definition of bittersweet".
Retired FBI profiler Clint Van Zandt said he and others have speculated that the serial killer had police or military training because of the sophistication of the crimes and the suspect's ability to elude capture. In another tweet, he said, "She would be beyond excited about this".
Now that a suspect in the killings has been identified, Oswalt said he felt a unusual mix of elation and impending sadness that McNamara was not alive to witness it.
Oswalt suspects otherwise, writing on Twitter that his late wife's book did, in fact, play a part. It kept interest and tips coming in. Pictures of DeAngelo today portray a grizzled, bald senior citizen who was a police officer during the time of the attacks and had only a minor criminal record. In certain ways, Gunderson, like McNamara, who founded the True Crime Diary website, toggled between her pleasant home life and her need to visit the dark corners of human brutality in order to find a killer. A look back at the Golden State Killer's crime spree that lasted a decadeShe said she overheard news of Joseph James DeAngelo's arrest yesterday and reached out to the director of the forensic lab who processed her case. At the time of her death, she was working on her book about the Golden State Killer investigation and documenting some of her findings on her website True Crime Diary.
On Tuesday, authorities arrested Joseph James DeAngelo, 72, a onetime cop.
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After losing his job on the police force, the suspect committed fewer crimes, but 10 were slayings and all were in Southern California.
"We have the law to suggest that he is innocent until he's proven guilty and that's what I'm going to ask everyone to remember", DeAngelo's public defender Diane Howard said outside court.
McNamara wrote in her book that she became interested in cold cases as a 14-year-old girl when a neighbour's murder went unsolved.
Oswalt hired investigative journalist Billy Jensen and Paul Haynes, who worked with McNamara, as a researcher, the Times noted, to piece together her book using her handwritten notes and 3,500 files on her computer. It was DNA evidence that led to DeAngelo's arrest.
"I don't like that they thought that my dad was the bad guy, but the truth is they were able to rule out people in my dad's (family) tree", she said.
Oswalt's initial reaction to the news of an arrest: "I think you got him, Michelle".
DeAngelo has been charged by the Ventura County District Attorney's Office with the 1980 murders of Lyman and Charlene Smith.