Dr. Harold Shipman. Fuckin' madass...yeah, i could say, bundy, dahmer, ramirez, chikatilo, zodiac, jack/ripper, gacy, sutcliffe, me (only kidding) etc but those guys wernt as calculating as shipman, nor did their reign of terror last as long. Knowone suspected shipman was 'offing' his patients till.......
Im just glad he wasnt my doctor, which, to all intent and purposes , he could have been...ya see, i live near hyde in Greater Manchester..
http://www.murderuk.com/serialkillers/drharold.htm