Authorities say a 69-year-old Durango man who was upset about not inheriting his mother's ranch killed two relatives before taking his own life.

The Durango Herald reports that William Decker also had been under investigation in a case related to child pornography before he died.

La Plata County Sheriff's Department spokesman Dan Bender said the U.S. Immigration and Customs Enforcement agents seized items from Decker's home in April.

Bender said authorities received a suspicious phone call from a farm about 30-miles southwest of Durango on Friday and found Decker dead. They found body of his nephew, Robert Decker, in a shallow grave on the property.

Police found Robert Decker's mother, 67-year old Billie Decker, dead at her Durango home.

William Decker's mother died in April and left the property to Robert Decker.