Robert James Wykel (born May 18, 1930; disappeared February 23, 1996) was a retired sheet metal worker from Burien, Washington, United States, who restored classic cars.
He has not been seen by anyone who could positively identify him since 1996, when he went to see a Ford Thunderbird he was interested in purchasing.
Myron Wynn, who accompanied him at that time, was convicted 15 years later of murdering Wykel.
Wynn maintains that he is innocent and that Wykel went to Argentina.The case was treated as a missing person investigation for years, despite early suspicion centering on Wynn, whom police named as a person of interest shortly afterwards.
Prosecutors charged him with the crime in 2009, although they had not found Wykel's body.
They relied on his conflicting and evasive statements to police during the initial investigation, and a diamond Wynn gave to his then girlfriend shortly after Wykel's disappearance.
Police believed the diamond belonged to Wykel, suggesting robbery as his motive for the murder.
After Wynn's first trial in 2010 ended in a hung jury, he was retried, convicted and sentenced to 20 years in prison.
The verdict was sustained on appeal.
The case has been featured in an episode of the Investigation Discovery series Disappeared.