Police are investigating an unexplained death near Monument Circle. Police were called to 31 W. Ohio St. at about 5:25 a.m. Thursday after the body of a man in his 50s was found near a loading dock in an alley between Market and Ohio streets. Police say the alley is a popular spot for the homeless to camp out. Investigators are looking into the cause of death. The identity of the victim has not been released.