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Where to watch "Killer Couples"
4. Episode 4
No release date yet
Finally in episode four, Mark explores the contemporary case of Lee Whiteley and Deborah Taylor - real-life natural born killers
3. Episode 3
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The bizarre 1970s case of Roy Hall and Michael Kitto (episode three) is perhaps the most incredible crime story you've never heard of.
2. Episode 2
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Episode two will feature John Duffy and David Mulcahy, who - in the 1980s - operated together as two of the most prolific rapists in British criminal history.
1. Episode 1
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In the first episode, Mark will examine the most infamous killer couple in UK criminal history - 1960s child-killers Myra Hindley and Ian Brady
