Michael Madsen, a frequent Quentin Tarantino collaborator on films like "Reservoir Dogs" and a veteran actor in "Free Willy" and more, has died at 67.

Actor Michael Madsen died from heart failure, his cardiologist has confirmed. The Reservoir Dogs star's doctor told NBC4 Los Angeles that heart disease and alcoholism will be named as contributing factors on the death certificate.

Michael Madsen, a tough guy character actor and frequent Quentin Tarantino collaborator, has died at the age of 67.