Jett Travolta's body shows no sign of head trauma and his death certificate says he was killed by a "seizure," an undertaker said Monday, as the 16-year-old's celebrity parents prepared for a Florida funeral.

An official with a Bahamian funeral home says Jett Travolta's death certificate says he was killed by a "seizure." Glen Campbell is assistant director of the funeral home handling the remains of John Travolta's 16-year-old son.

Doctors in the Bahamas conducted an autopsy Monday on John Travolta's 16-year-old son, but authorities did not immediately disclose the results.

The Batman blockbuster "The Dark Knight" is among the films competing for best-picture honors from the Producers Guild of America.