D.C. detectives in the 3rd Police District were investigating two shootings and a stabbing early yesterday that left one man dead and two in critical condition.

Police who arrived at a rooming house in the 1300 block of T Street NW at 3:35 a.m. yesterday found a 26-year-old man who had been shot in the house. The man, whom police did not identify because relatives had not been notified, was taken to D.C. General Hospital and pronounced dead at 7 a.m.

A second man, 31, was found alive on the second floor, police said. He had been stabbed and was in critical condition at Howard University Hospital yesterday, police said.

Shortly before 4 a.m., a 23-year-old man, who had been shot at least once, was shoved out of a blue sport-utility vehicle at the entrance to the Howard University Hospital emergency area, according to a hospital spokeswoman. The vehicle left. The man was in critical but guarded condition yesterday, officials said.

Cmdr. Jose Acosta of the 3rd District said the shooting of the 23-year-old man may be linked to the stabbing and fatal shooting. The two men who were hospitalized are both suspects and witnesses, Acosta said.

A resident of the Llewellyn/ Scott Catholic Worker House of Hospitality, which is next to the rooming house, said all three victims had lived there for more than a year.

"I heard 10 pops, and it sounded as if it was wood smacking together," said the neighbor, who called 911. "There was a six- to eight-second pause, and then I heard four or more shots."