[HIGHLIGHTS] The day Oscar Ringo Bonavena was murdered, told by his children

In 1976, Muhammad Ali was killed in a car crash. His son tells of his father's death in a new documentary.

The film is called "Muhammad Ali: My Father Was A Boxer" It airs on CNN at 9 p.m. ET on Sunday, May 21. For more information, visit CNN.com/MuhammadAli. For confidential support, call the Samaritans on 08457 90 90 90, visit a local Samaritans branch or see www.samaritans.org.