Transcript for 'Your Biggest Fan' - The 20/20 Event Special - Tonight at 9/8c on ABC
This guy went to her Condo and she opened the door and shot her. And she's dead flat. It was one of the most chillingly awful surprising. Kinds of killings because no one was really aware of the problems of stalkers Rebecca street this case still aren't always. And it always well. She just had a very natural qualities she doesn't like a kid that have been raised in Hollywood that you had a certain present for that patient who was on the brink of stardom and really everybody loved. We're back and I were sitting in her trailer and we got a call from the guards saying there is a man here who says he has presents for you and he's saying that he knows you who had her. Her own hands she was going to be case and he sends her family and and thoughtful post Clinton picture back when he received that letter this fire is already burned and now you've got gasoline packed. In his diary. I have an obsession with the unattainable. I need to destroys that which I cannot obtain. He hired a private guide to find her address. She was expecting. A courier to deliver script for her a couple of her neighbors had seen a man kind of lurking around but let's face it Hollywood. No one at that age ever three weeks and endanger. When she came down to open the door it wasn't she expect. He didn't give her a chance. Shot her point blank. I just kept saying no no no everything got quiet. Oh my god it was heartbreaking. This was such an extraordinary. Ugly. Horrible loss of an Angel so unreal input to heart but I couldn't just walk up the somebody's house and truth and. Obsession and hunting tragedy in the shadows. Almost thirty years after her murder new details new interviews. I want it makes sense but to hear that it was a fan it was the worst thing I've ever heard. And a phone call you and her. Reduced from between each 12 hour event special Friday.
This transcript has been automatically generated and may not be 100% accurate.