Madsen died from cardiac arrest, his manager Ron Smith told NBC News. Cardiac arrest occurs when the heart stops functioning. It can lead to death without immediate treatment, according to Mayo Clinic.

Michael Madsen apparently went into cardiac arrest and was found unresponsive in his home in Malibu, California, on Thursday morning, according to his manager.

Actor Michael Madsen Shares Biggest Regret in Last Interview Before His Death originally appeared on Parade. Actor Michael Madsen died from cardiac arrest on July 3, 2025, at the age of 67. The Reservoir Dogs star passed away at his home in Malibu, California.