Joseph Edward Duncan

Joseph Edward Duncan

| Credit: Kathy Plonka-Pool/Getty

Joseph Edward Duncan III died on death row in Indiana over the weekend.

The convicted murderer died Sunday after previously been diagnosed with stage IV brain cancer, the United States Attorney's Office for the District of Idaho announced in a press release.

Duncan, 58, was sentenced to death in 2008 and had been in custody on death row at the Terra Haute Federal Correctional Institution.

He was found guilty of kidnapping and murdering 9-year-old Dylan Groene in Coeur d'Alene, Idaho, in May 2005 after also killing his mother, Brenda Groene, 40, her boyfriend Mark McKenzie, 37, and the boy's 13-year-old brother, Slade Groene, according to another press release from the Office of the District Attorney in Riverside County, California.

He then kidnapped Dylan and his 8-year-old sister Shasta Groene, taking them to Montana's Lolo National Forest to torture them both before killing Dylan, according to court records, the District of Idaho press release said.

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That July, Shasta was rescued and Duncan was arrested when they were seen at a Coeur d'Alene Denny's restaurant.