"The location of the bruises, the multiplicity of the bruises, lack of head trauma, or facial bruising support bruising having occurred prior to entry in the water," the amended report states. "Since there are unanswered questions and limited additional evidence available for evaluation, it is opined by this Medical Examiner that the manner of death should be left as undetermined," Chief Medical Examiner Dr. Lakshmanan Sathyavagiswaran wrote in the report completed in June.
Officials also considered that Wood wasn't wearing a life jacket and had no history of suicide attempts and didn't leave a note as reasons to amend its report and the death certificate.
The report was released Monday after sheriff's officials released a security hold.
Sheriff's spokesman Steve Whitmore said the agency has known about the findings in the newly released autopsy report for several months and it does not change the status of the investigation, which remains open. He said Wagner is not considered a suspect in Wood's death and the agency hasn't said they have any suspicions about Walken or the boat captain, Dennis Davern.
Wood, famed for roles in such films as "West Side Story" and "Rebel Without a Cause," was nominated for three Academy Awards during her lifetime. Her death stunned the world and has remained one of Hollywood's most enduring mysteries. The original detective on the case, Wagner and Walken have all said they considered her death an accident.
Conflicting versions of what happened on the yacht have contributed to the mystery of how the actress died. Wood, Wagner and Walken had all been drinking heavily in the hours before the actress disappeared.
The newly released report states there are conflicting statements about when the boat's occupants discovered Wood was missing. The report estimates her time of death was around midnight, and she was reported missing at 1:30 a.m.