Dennis Nilsen: The Kindly Killer

S1 E6: One of Britain's most infamous killers, Dennis Nilsen murdered 15 young men, some as young as 14, in London during the late seventies and early eighties. Nilsen held on to the corpses of his victims for weeks on end, talking to them on his return home from work and sleeping beside them. But what led this seemingly normal civil servant to start killing for company?