Douglas Supporting Johnson Family

Johnson, heir to Johnson & Johnson cosmETics company, was found dead at her Los Angeles home last week (04Jan10) at the age of 30.

And the Wall Street star admits he's been on hand to help her grieving parents, Robert 'Woody' Johnson and his ex-wife Nancy, known as 'Sale', deal with their loss.

He tells ETonline.com, "It's a terrible, terrible tragedy. Woody is a distant relative, a dear, dear friend of mine. My heart goes out to him and his ex-wife Sale, Casey's mom. It's the worst thing that could happen to anyone, losing a child.

"I've talked briefly (with them). They're grieving, as one would expect, and there's nothing really you can do. I think it just takes a lot of time. It's a tragedy."

An autopsy on Johnson's body showed there were no signs of trauma, but the cause of death has been deferred, pending toxicology tests.