Actor Matthew Perry, 54, was found unresponsive in the hot tub at his home by first responders on Saturday afternoon.

TMZ reports its sources say emergency personnel were responding to a call for cardiac arrest. Perry is reported to have died from drowning.

Perry had been open about his struggles with addiction in the past, but according to TMZ, no drugs were found at the scene and there was no sign of foul play. The actor had played pickleball earlier in the day.

More details are surfacing about the circumstances surrounding Matthew Perry's death ... as sources tell us he actually died at his own house after some physical activity this morning.

We're told Matthew came home sometime in the AM after a 2-hour round of pickleball, and that he sent his assistant out on errand shortly thereafter. We're told when the assistant returned about 2 hours later, he discovered Matthew unresponsive ... and called 911.

Unclear if what Matthew was doing before his passing played any role in his death at this point -- the investigation into his death is underway.

The actor's most famous role was Chandler Bing on the ‘90s sitcom "Friends." He also starred in "17 Again," "Fools Rush In," and "The Whole Nine Yards."

The LA Times reports authorities responded around 4 p.m. PT.

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