Joseph Lester Deschon, convicted in Lewis & Clark County on a charge of deliberate homicide, has died in the Montana State Prison.
Prison officials said in a press release that Deschon, 56 years old, died on Monday following an extended illness.
He was sentenced in March 2000 to a 50-year sentence for the November 1999 murder of his nephew, James Azure.
Court documents state that on November 6, 1999, Azure and Deschon were arguing, and the argument escalated and Azure struck Deschon.
Deschon grabbed a knife and stabbed Azure.
When Azure was taken to the hospital, he was in cardiopulmonary arrest. A physician performed an emergency thoracotomy and discovered that the sack surrounding the heart was full of blood.
Doctors determined that Azure had sustained irreversible brain damage from the lack of oxygen.
Approximately a week later, Azure's family decided to remove him from life support, and he died soon after.
The state medical examiner concluded that Azure died from complications of a stab wound to the chest.
Deschon admitted stabbing Azure, but told police that he was protecting himself.
Deschon had several other convictions, including sexual assault, bail jumping, and assault.