A 74-year-old South Carolina man and his nephew have been found dead at their homes in Lyman, and investigators say they want to talk to another relative about the killings.

Spartanburg County deputies say 46-year-old Marshall Tapp's son found him dead in his home Thursday evening.

Investigators started tracking down family members to interview and found the body of Tapp's uncle, 74-year-old Kenneth Tapp. He was found in a field behind his home about four hours later.

Sheriff's spokesman Maj. Dan Johnson said Friday that deputies want to talk to 54-year-old Phillip Tapp and called him a person of interest in the case.

Johnson says Phillip Tapp lived with his cousin Marshall Tapp, and hasn't been seen since the bodies were found.