Bill Paxton died from a stroke 11 days after undergoing heart surgery, his death certificate has revealed.
The actor had received valve replacement surgery to repair an aortic aneurysm on February 14, according to the document published by TMZ.
He passed away suddenly at Los Angeles' Cedars-Sinai Medical Centre on February 25, aged 61.
An original statement from Paxton's family had said the actor died following "complications from surgery".
Paxton was best known for supporting roles in James Cameron's blockbusters Aliens, Titanic and True Lies and a leading turn in the HBO drama Big Love.
A versatile actor with over 93 credits to his name, his death drew countless tributes from co-stars and colleagues, including Tom Hanks, Helen Hunt, Jamie Lee Curtis and Arnold Schwarzenegger.
"Bill Paxton could play any role, but he was best at being Bill - a great human being with a huge heart," Schwarzenegger tweeted.
Stormchasers across the globe, inspired by his performance in the 1996 film Twister, also honoured the actor by spelling out his initials in GPS coordinates over the US's Tornado Alley.
The actor had been starring in the CBS drama Training Day - a TV reboot set 15 years after the events in the 2001 film starring Denzel Washington and Ethan Hawke - at the time of his death, completing all 13 episodes.
Last week's episode opened with a tribute to the star, remembering "our friend and colleague".
Paxton is survived by his wife Louise and two children.