A comedian and author has praised his late wife, Michelle McNamara, for her role in the apprehension of a former police officer suspected of a string of US murders, rapes and burglaries.
"You did it, Michelle," Patton Oswalt said in an Instagram video.
"The cops are never going to say it but your book helped get this thing closed."
McNamara died suddenly in 2016 after years spent investigating the unsolved California crimes for a book.
The book - I'll Be Gone in the Dark: One Woman's Obsessive Search for the Golden State Killer - was completed posthumously and published in February, becoming a bestseller.
On Wednesday, California police said they had arrested a 72-year-old former police officer, Joseph James DeAngelo, in connection with the case.
They said "discarded DNA" had been used to match him to crimes attributed to the so-called Golden State Killer - suspected of 12 murders, 51 rapes and more than 120 burglaries.
Mr DeAngelo has initially been charged with eight counts of murder.
Police have played down any direct role by the book in the identification of the suspect.