Published on: February 26, 2004

"Monster" star Charlize Theron leads a secret life filled with her own monstrous demons – including a gruesome family killing, a shattering career blow and shocking drug whispers.

And The ENQUIRER has learned exclusively that she's planning a hush-hush marriage to her longtime boyfriend, Irish actor Stuart Townsend.

The issue that goes on sale Friday reveals how Charlize's mom shot her abusive husband to death after he threatened to kill her and 15-year-old Charlize, how the killing played a key role in the beauty's most surprising career move … and more.