25 most evil serial killers in history of the world – Their evil deeds will shock you (+Photos)

21 Kenneth Bianchi and Angelo Buono (The Hillside Stranglers)

Between late 1977 to early 1978 cousins Kenneth Bianchi and Angelo Buono carried out a reign of terror in California, kidnapping, raping and killing 10 girls aged between 12 and 28 years old, strangling each victim in the hills above Los Angeles which led to them being known as ‘the Hillside Stranglers’. Bianchi attempted to plead not guilty by way of insanity but was found to be faking mental illness, so instead agreed to plead guilty and testify against Buono. Both were sentenced to life imprisonment. Buono died of a heart attack in his cell in 2002. Also See: Top 10 amazing facts about Adolf Hitler (With Photos)