In 2006, McNamara launched her website TrueCrimeDiary. McNamara had a long-standing fascination with
true crime originating from the unsolved murder of Kathleen Lombardo that happened two blocks from where she lived when she was young. In 2014, McNamara and true crime investigative journalist Billy Jensen were on a
SXSW Interactive panel called "Citizen Dicks: Solving Murders With Social Media". McNamara and Jensen had a long-term friendship based on their shared passion for researching and writing about true crime. McNamara became interested in the crimes of the unidentified rapist and murderer known as the East Area Rapist, Original Night Stalker and the
Visalia Ransacker, among other epithets. Due in large part to McNamara's efforts in tying these crime clusters together in public consciousness after the EAR and ONS crimes were linked by DNA, the murderer was later to be known only as the
Golden State Killer (GSK). She penned articles for
Los Angeles magazine about the serial killer in 2013 and 2014. She then signed a book deal with
HarperCollins and began to work on a book about the case. The book remained on the list for 15 weeks. On April 9, 2018,
HBO announced that it had purchased the rights for her book and was developing it into a documentary series. The documentary series, also titled ''
I'll Be Gone in the Dark'', is directed by
Liz Garbus On the evening of April 24, 2018, authorities in California identified
Joseph James DeAngelo as the Golden State Killer and arrested him at his home. Oswalt stated that authorities' use of the killer's nickname that McNamara coined was "proof of the impact of her work". ==Personal life==