BOYS TOWN, Neb. (AP) — Authorities say an 18-year-old whose body was found in his room at Omaha’s Boys Town died of natural causes.

On Friday a news release from the Douglas County Sheriff’s Office said an autopsy shows Larry McBryde died of cardiac dysrhythmia, or abnormal heart rhythm, associated with cardiac fibrosis, a condition that can affect the heart valves and muscle.

The body of McBryde, who was from Erwin, North Carolina, was found on the floor of his room the morning of Feb. 22. He was last seen alive around 10:45 the night before.

Boys Town was founded as an Omaha orphanage in 1917 by the Rev. Edward Flanagan and now is situated in western Omaha, serving as a residential center for troubled youth.