Portland police say a 27-year-old security guard at Mercy Hospital was fatally shot while on his break early Sunday morning.
Police identified the victim as James Angelo, who died in Maine Medical Center.
Police Chief Joseph Loughlin says witnesses report that two people walking along Winter Street fled in opposite directions after shots were fired around 4 a.m. Sunday.
Loughlin urges anyone who may know the identity of the two to contact police.
Angelo and his family had moved to Portland from the Sudan in 1995.
Loughlin characterized the shooting as a tragedy and vowed that whoever is responsible will be brought to justice.