Mystery surrounds Natalie Wood's death

A new report shows coroner's officials amended Natalie Wood's death certificate based on unanswered questions about bruises on her upper body.

This photo released by the Los Angeles County Registrar/County Clerk shows page 2 of actress Natalie Wood's death certificate. Authorities amended Wood’s death certificate on Aug. 1, 2012 to reflect some of the lingering questions about how the actress died in the waters off Catalina Island in November 1981. The changes include altering her cause of death to “Drowning and other undetermined factors” and adding the statement “Circumstances not clearly established” to how Wood ended up in the water while on a yacht with husband Robert Wagner and actor and co-star Christopher Walken. (AP Photo/ Los Angeles County Registrar/County Clerk)

Robert Wagner and wife Natalie Wood arrive for the premiere of "some came running" in Hollywood, Los Angleles on December 18th, 1958.

Natalie Wood and Warren Beatty arrive at the 1961 premier for "The Children's Hour".

Actress Natalie Wood holds her two children Natasha, left, and Courtney at a studio party in Los Angeles.

Natalie Wood and Robert Wagner in a scene from "All the young canibals".

Lana Wood poses with her sister, the late actress Natalie Wood, right, when they were children. (Photo courtesy of Lana Wood/Delivered by Newsmakers)