Detectives have launched a murder investigation into the death of a man in his 40s who was found with blunt force trauma to the head on Monday morning inside a DUMBO apartment building that is comprised largely of supportive housing.

Officers from the 84th Precinct responded at approximately 5:52 a.m. on Aug. 25 to a 911 call reporting an unconscious and unresponsive man inside an apartment at 90 Sands St., finding the victim with trauma to the head. Paramedics pronounced him dead at the scene.

The Office of the Chief Medical Examiner is conducting a post-mortem examination to determine the official cause of death, police said.

Authorities said the victim has not yet been identified, and there are no suspects or persons of interest at this time.

Police sources indicated that no weap

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