A Mattapan man was held on high bail at his Dorchester District Court arraignment this afternoon on charges that he shot and seriously injured a 31-year-old man, nearly killing him, Suffolk County District Attorney Daniel F. Conley said.

LEONARD YOUNG (D.O.B. 6/27/78) was charged with armed assault with intent to murder, assault and battery with a dangerous weapon, carrying a loaded firearm, and two additional firearms-related counts charged as second and subsequent offenses – carrying a firearm, and unlawful possession of ammunition – for his alleged role in today’s shooting.

District Court Judge James W. Coffey imposed bail in the amount of $250,000.

Assistant District Attorney Brendan Cox told the court that at about 1:00 this morning, Boston Police officers were in the area of 49 Stoughton Street when they observed a large crowd outside of a local bar begin to run and heard gunshots being fired.

Cox told the court that witnesses pointed the defendant out to officers, who observed him walking down Stoughton Street towards Sumner Street talking on a cellular phone. Officers further observed the defendant bend down as he walked near a parked car and make a motion like he was tossing something, the prosecutor said. Several officers detained Young while others went to where they’d seen Young bend down; there, officers found a set of keys with an Acura key in the ring.

The victim was discovered inside of a motor vehicle on Belden Street suffering from multiple gunshot wounds to the chest and was rushed by ambulance to a local hospital with life-threatening injuries, Cox said. The victim remains in critical but stable condition.

Cox told the court that witnesses identified Young as the shooter. During the course of the investigation, Cox said, officers recovered a black revolver inside of the Dorchester North Burying Ground directly across from 49 Stoughton St. They also located an unattended Acura on Stoughton Street and took that vehicle into custody.

Cox told the court that Young was previously convicted in 1997 of unlawful firearm and ammunition possession in Dorchester District Court.

Young was represented by attorney Jessica Tripp and is expected to return to court on August 10.