Travolta, Preston 'Heartbroken' Over Son's Death

Travolta's Loss and Grief

Regardless of the cause, Ossi said that the family is now grieving. He added that the incident "is the worst pain any parent can experience, the loss of child."

Speaking for John Travolta, Ossi said, "This is the worst day of his life."

Ossi said that Dr. Mark Smith, the Travolta family doctor, plans to give a statement after the autopsy.

ABC News' Eileen Murphy, Lauren Cox and Kirk Fernandes contributed to this report.