The Devil's Disciple
- Episode aired Apr 21, 2015
The case of British serial killer Patrick David Mackay who is suspected to have murdered up to 13 people in the 1970s.The case of British serial killer Patrick David Mackay who is suspected to have murdered up to 13 people in the 1970s.The case of British serial killer Patrick David Mackay who is suspected to have murdered up to 13 people in the 1970s.