Callous John Wayne Gacy mocked mother of one of his victims - and urged her to take her own life

John Wayne Gary publicly urged the grieving mother of one of his victims to kill herself with a drug overdose.

Dolores Nieder, mum of 19-year-old John Mowery who was murdered by the Killer Clown in 1977, frequently appeared on TV during the 1980s commenting on the post-sentencing lifestyle of the Chicago serial killer.