The actor, best known for his roles in Top Gun, The Doors, and Batman Forever, died aged 65 on April 1 in Los Angeles from what was thought to have been pneumonia, and now TMZ has confirmed the news.
A copy of the death certificate obtained by the outlet on Thursday declared the "immediate cause" of his passing was the inflammatory condition of the lung, but also confirmed that "acute hypoxemic respiratory failure, chronic respiratory failure, and squamous cell carcinoma of the base of the tongue" were all underlying factors.
Other factors included "malnutrition, and a tracheocutaneous", and the outlet claimed that the Hollywood star was cremated on Monday.
His cause of death was originally confirmed by his daughter Mercedes Kilmer, who disclosed the information to to the New York Times newspaper.
Mercedes also noted that Kilmer had been diagnosed with throat cancer in 2014, but later recovered from the disease.
The actor made his movie debut in 1984 spy spoof Top Secret but was best known for his portrayals of the late rocker Jim Morrison in 1991 biopic The Doors, the Caped Crusader in Batman Forever, and Tom "Iceman" Kazansky in 1986's Top Gun.
Kilmer's final movie appearance came in 2022's Top Gun: Maverick, where he reprised his role as Iceman and shared a brief and "emotional" moment with co-star Tom Cruise.
His pal told talk show host Jimmy Kimmel in 2023: "I just want to say that was pretty emotional.
"I've known Val for decades, and for him to come back and play that character… he's such a powerful actor that he instantly became that character again."
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