Jett Travolta's autopsy was completed Monday. According to his death certificate, Jett's death was caused by seizure.

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The Travoltas released a statement on Jett's death late Sunday:

We would like to extend our deepest and most heartfelt thanks to everyone who has sent their love and condolences.

Jett was the most wonderful son that two parents could ever ask for and lit up the lives of everyone he encountered. We are heartbroken that...