University Police discovered the body of a 50-year-old homeless man on a Ross Hall heating vent Saturday night.

At 5 p.m., UPD received an anonymous call that an unconscious black male was lying under a concrete overhang on the 24th Street side of Ross Hall, said Metropolitan Police Lt. Mark Carter.

After several failed attempts to revive the man with a defibrillator, UPD contacted MPD and the D.C. Fire and Medical Services Department.

City officials pronounced the man dead upon arriving at the scene, fire department spokesman Alan Etter said. Officials said they are unsure when the man died.

MPD found no bruises or injuries on the man’s body, said Carter, adding that the death could possibly have been precipitated by a previous medical condition. MPD declined to release the man’s name.

“Apparently, he’d been staying there to stay warm,” said Etter, who speculated that below-freezing temperatures could have led to the man’s death.

“Certainly in the last few days it’s been … cold enough to have exposure death,” he said.

Etter said an autopsy would be performed on the man’s body sometime this week.