He was a doctor and a serial killer.
It is estimated that he killed 250 people over 30 years.
He was born in 1946.
He targeted vulnerable elderly people with fatal dose of drugs.
He studied medicine at Leeds School of Medicine.
He was married and had 4 children.
He was arrested in 1998 and a year later his trial began.
In 2000 he was found guilty of 15 murders and for this he was sentenced to life imprisonment in 2000.
4 years later he hanged himself in his sell.
[Source: en.wikipedia.org]