A man who was found guilty of shooting and killing six hunters during a confrontation over trespassing has died.

According to CBS News, Chai Vang, 57, died at a hospital earlier this month. He was serving a life sentence at the Oshkosh Correctional Institution for the 2004 murders.

The Wisconsin Department of Corrections provided no cause of death, citing privacy laws.

In 2005, a jury found Vang guilty of six counts of first-degree intentional homicide and three counts of attempted homicide, triggering a mandatory life sentence.

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Based on testimony, the hunting group confronted Vang after they discovered him trespassing in a treestand on private property in Wisconsin's northwestern woods on Nov. 21, 2004. According to the two survivors of the shooting, their group did not shoot at Vang before he fired at them.

A Hmong immigrant who lived in St. Paul and was a father of six, Vang told investigators he got lost chasing a deer and climbed into the tree stand, not realizing he was on private property. He claimed the group of white hunters called him racial slurs and shot first, which the survivors denied.

The victims were 42-year-old Robert Crotteau, 42, Joey Crotteau, 20, Al Laski, 43, Mark Roidt, 28, and Jessica Willers, 27.