United Kingdom, Dec. 20 -- Albert Brooks is still in disbelief over the death of his friend Rob Reiner.

The 78-year-old actor and comedian has been left in shock by the tragic passing of the When Harry Met Sally... filmmaker - who he had known since they were high school students 60 years ago.

Reiner and his wife Michele were found stabbed to death in their Los Angeles home last weekend and their son Nick has been charged with first-degree murder.

Speaking on the upcoming programme CBS News: Rob Reiner - Scenes from a Life, Albert said: "Rob was my oldest friend. It's that simple. He's the person I've known longest. I met him when I was 14 years old. So I'm still in that not believing it stage."

Brooks confessed that there are still m...