Hollywood is mourning the loss of Michael Madsen after the actor and Quentin Tarantino collaborator died of cardiac arrest.

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.

Michael Madsen’s youngest son, Luke, posted a touching tribute to the Reservoir Dogs and Kill Bill star. “My Hero Wore a Cowboy Hat,” the 19-year-old wrote in an Instagram post, where he shared three photos of himself and his father,