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.

Virginia Madsen mourned the loss of her brother Michael Madsen with a touching tribute, describing him as "thunder and velvet."

Michael Madsen's sister, Virginia Madsen, shared a moving post about the actor who died on Thursday from cardiac arrest. He was 67. The actress shared a black and white photo of the siblings on Instagram along with a message on behalf of her and their family.