LINCOLN -- Lincoln Police are investigating what may be a homicide, following a stabbing that happened just before 9am Tuesday in downtown Lincoln. Captain David Beggs says medical units were called to an apartment building at 531 South 18th for a report that a man had been stabbed. The victim was transported to Bryan West Campus in critical condition, where he later died. It is not known where the man sustained the stab wound. Beggs says the stabbing was not a random occurrence and that neighbors should feel safe. He says there was a group of three people at the apartment at the time and they were in custody and being questioned.