The passing of Robert Redford has brought renewed attention to a decades-old mystery: the unsolved murder of his daughter’s boyfriend—and the fugitive suspect who vanished without a trace. In 1983, Redford’s daughter, Shauna, was dating Sid Wells, a University of Colorado Boulder student who was shot and killed in his apartment. Redford, who was preparing to film The Natural at the time, put his career on hold to support his daughter and attend Wells’ funeral, per the Guardian. Initial suspicion fell on Wells’ roommate, Thayne Alan Smika, but prosecutors declined to charge him, citing a lack of evidence. Smika subsequently disappeared in 1986.

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Undated photo of Thayne Smika Age progression of Thayne Smika