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Now Playing: JonBenet Ramsey’s half-brother says volunteers work 'daily' to find her killer
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Now Playing: Family of detective dedicated to finding JonBenet Ramsey’s killer continues his work
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Now Playing: Rodney Alcala refuses to reveal whether there are more victims: Part 11
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Now Playing: Family of 1977 murder victim finds answers in 2013: Part 10
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Now Playing: Rodney Alcala’s trophies help identify 4 victims decades after their murder: Part 9
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Now Playing: Rodney Alcala convicted and sentenced to death for killing 12-year-old girl: Part 8
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Now Playing: Rodney Alcala kills 12-year-old Robin Samsoe, his final murder: Part 7
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Now Playing: Rodney Alcala appears on ‘The Dating Game’ and wins amid killing spree: Part 6
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Now Playing: Rodney Alcala questioned for murder but released when no body was found: Part 5
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Now Playing: Rodney Alacala spends less than 3 years in prison, returns to NYC: Part 4
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Now Playing: Using an alias, Rodney Alcala moves to New York City and kills: Part 3
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Now Playing: Survivor recalls getting in serial killer Rodney Alcala’s car at 8 years old: Part 2
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Now Playing: A missing woman's cold case and a killer's appearance on 'The Dating Game': Part 1
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Now Playing: Serial killer survivor recalls being approached by Rodney Alcala as a young girl
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Now Playing: California woman recalls identifying Rodney Alcala in 'Dating Game' segment
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Now Playing: ‘Dating Game’ producers, contestant on serial killer Rodney Alcala being on the show
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Now Playing: Nayeri is sentenced to life in prison without parole: Part 11
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Now Playing: Rodney Reed’s execution is stayed but he faces an uncertain future: Part 11
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Now Playing: Rodney Reed case receives celebrity attention, public support: Part 10
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Now Playing: Innocence Project takes up Rodney Reed's casen: Part 9