Actor Michael Madsen’s son, Hudson, 26, has died of a self-inflicted gunshot wound to the head, according to officials. Hudson, who was the godson of his dad’s frequent collaborator Quentin Tarantino, was on the island of Oahu at the time of his death, Metro reports. The death by suicide was confirmed by the City and County of Honolulu Department of the Medical Examiner to the Daily News Tuesday. “We are heartbroken and overwhelmed with grief and pain at the loss of Hudson,” the family told the UK outlet in a statement from a representative for the “Reservoir Dogs” and “Kill Bill” actor. “His …