The convicted murderer had been on death row for the 2005 killing of a 9-year-old boy

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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.

"This crime was horrendous and its impact on the families, the community, the jurors, court staff, our litigation team, and law enforcement were far reaching," acting U.S. Attorney Rafael M. Gonzalez, Jr. said in a statement. "While his death will not bring back the lives cut so tragically short or remove the indelible memories of his unspeakable acts, perhaps death will now allow space for some degree of healing, peace, and closure."

Duncan confessed to killing the family as well as to killing multiple other children, including 10-year-old Anthony Martinez in 1997.

Anthony's mother Diana said in a statement Sunday of Duncan's death: "The sun is brighter today, and my soul is lighter."

"The world is a more beautiful place without the evil that is Joseph Duncan," she added. "God chose to make his end a long suffering and I believe that is fitting. The horror of his thoughts consumed him."