FARGO, N.D. (AP) — The parents of a Minnesota teenager found dead in a North Dakota State University dorm last month say he died of a heart problem.

The parents of 17-year-old Devin Delaney say in a statement the medical examiner's report says he died in his sleep due to problems associated with a heart inflammation. It's most commonly the result of a viral infection.

The family says the autopsy report indicates Delaney's blood tested negative for drugs and alcohol, and his death is listed as the result of natural causes. They say he hadn't previously shown signs of a heart ailment.

The teenager from Burnsville died after being found unresponsive in the NDSU dorm in Fargo on Sept. 17. He had been visiting friends at the school and attending a music festival there.