This always stands out to me as my mum & dad used to live next door to his first house where he killed several men.
http://en.wikipedia.org/wiki/Dennis_Nilsen
Dennis Andrew Nilsen (born 23 November 1945, Fraserburgh, Scotland) also known as the Muswell Hill Murderer and the Kindly Killer is a Scottish serial killer who lived in London.
He killed at least fifteen men and boys in gruesome circumstances between 1978 and 1983 and was eventually caught after his disposal of dismembered human entrails blocked his household drains: the drain cleaning company found that the drains were congested with human flesh and contacted the police.
Due to the similarities between their crimes, sexuality and lifestyle, Nilsen has been referred to as the "British Jeffrey Dahmer."[1]
The full story- http://www.trutv.com/library/crime/serial_killers/predators/nilsen/stranger_1.html