His staffer made a frantic 911 call and referred to a drowning in the 15-second dispatch audio clip.
Cops confirmed the death was being investigated but no foul play is suspected.
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Over the years, the famous actor had been candid about his struggles with alcohol, drugs, and health problems.
No narcotics were discovered at the scene, but authorities found anti-depressants, anti-anxiety drugs, and a drug for chronic obstructive pulmonary disease.
On the morning of his death, Matthew had played racquet sport pickleball with a female friend, who revealed the star had felt unwell and “fatigued” over the past week.
WARNING SIGNS
Matthew’s pickleball player revealed to Extra host Billy Bush, 52, that she may have spotted some scary warning signs during their last match together.
He shared what he found out on Instagram.
“I spoke to the woman he played with this morning and every morning,” Billy began his lengthy post.
“She is in shock, adored Matt … she said he had been fatigued today and over the past week.
“A little more than usual. He played for one hour, then went home.”
Billy mentioned the actor played the sport “every day and sometimes twice. It regulated his days.”
CASTMATES TRIBUTE
On Monday, the cast of Friends – Jennifer Aniston, Courteney Cox, David Schwimmer, Matt LeBlanc, and Lisa Kudrow – shared a joint statement on the loss of their “family” member.
“We are all so utterly devastated by the loss of Matthew. We were more than just cast mates. We are a family,” their statement, which was first obtained by People, reads.
“There is so much to say, but right now we’re going to take a moment to grieve and process this unfathomable loss.
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“In time we will say more, as and when we are able,” the statement continues. “For now, our thoughts and our love are with Matty’s family, his friends, and everyone who loved him around the world.”
The note is signed by each of his co-stars.
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He was spotted out at a restaurant with a mystery womanCredit: Warner Bros
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Matthew died on Saturday, October 28 at his home in Los AngelesCredit: Getty