His crimes began in 1975 with an unsuspecting couple on a picnic outside of Walla Walla. Robert Yates murdered 16 people by the time the Spokane Sheriff's Office caught up with him in 2000.

A father, husband and military veteran, Robert Yates was not someone you'd suspect to be the Spokane Serial Killer.

In this episode of our true-crime streaming series 509's Most Notorious Crimes, we go back into the archives to unmask a killer who hid his secret for decades - and hid one of his bodies in his own yard.

509's Most Notorious Crimes: Robert Yates premieres Wednesday November 5th at 7 pm, commercial-free on KXLY+

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