A sad story. Authorities suspect drugs were involved.

Chelsia Rose Marcius and Barry Paddock of the New York Daily News reported.

Columbia University student critically injured in apparent jump from eighth floor of Wien Hall dorm

A Columbia University student believed to be high on drugs was critically injured when he apparently jumped from an eighth-floor dorm room on Monday night, cops and fellow students said.

The 19-year-old man, identified by police sources and fellow students as Brandon Marco, lives on the eighth floor of Wien Hall, a 14-story undergraduate dorm on W. 116th St. and Morningside Drive in Morningside Heights.

He wandered into the room of a fellow student, just down the hall from his, acting irrationally and apparently under the influence of drugs, police sources said. The occupant of that room, a young woman, became alarmed when Marco suddenly removed all of his clothes.

When cops arrived in response to a 911 call about 8:35 p.m., they found the dorm room’s window open, cops said. Marco was found on a third-floor landing below.

He was conscious as paramedics rushed him to Mount Sinai St. Luke’s Hospital, officials said.

But a police source said late Monday night that Marco was suffering from severe internal bleeding and that his condition was “very critical.”