United Kingdom, April 28 -- Karissa and Kristina Shannon feared they would end up dead in the years after they left the Playboy mansion.

The twins were just 19 years old when they moved into the famous abode in 2008 and began an 18-month relationship with the late Hugh Hefner - who died in 2017 - and spiralled out of control after leaving in 2010, ultimately hitting rock bottom when they were left feeling "suicidal" after struggling with alcohol, pills, and Kristina being arrested for DUI.

Referring to former Playboy model Anna Nicole Smith, who died from combined drug intoxication in 2007, Kristina told People magazine: "Everyone was saying we were going through our 'Anna Nicole phase'.

"We gained weight. There was alcohol and pills. ...