Hilo police detectives are investigating a homicide at an apartment complex in downtown Hilo. They were called to a disturbance in a building on Ululani Street at about 7:30 p.m. Wednesday. When they arrived they found an unresponsive 59-year-old man in the apartment. He was pronounced dead at Hilo Medical Center. Police arrested a 52-year-old woman and 63-year-old man at the scene on suspicion of second-degree murder. Charges are pending.