Season 6 Episodes12
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Ranked #7 of 12 in Season 6•−0.1 vs season avg
Profiling rapists and serial killers John Duffy and David Mulcahy, who together attacked numerous women at railway stations in the south of England through the mid-1980s, killing three.
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"John Duffy and David Mulcahy" is episode 2 of Born to Kill? season 6. It scored 7.1/10 from 23 votes, ranking #7 of 12 episodes this season (season average 7.2). It aired on June 10, 2015.