A disturbing clip shows the moment serial killer Aileen Wuornos proudly admits to killing seven men, before revealing exactly why she did it.

Wuornos shot, killed and robbed seven men between 1989 and 1990 before being arrested in early 1991.

During the trial, Wuornos claimed she had acted in self-defence, saying that the men she had killed had originally solicited her for sexual services but then either threatened to kill her, raped her or attempted to rape her.