Frank L. Fields Jr., 27, was found by police bleeding from his armpit area about 1:40 a.m. in the 1000 block of West 151st Street, East Chicago police said in a statement.
Officers applied a tourniquet to his arm, but he was pronounced dead later at St. Catherine Hospital, police said.
A preliminary investigation found that Fields was stabbed while arguing with his mother’s boyfriend, police said. The suspect left the scene after the stabbing, but was arrested a short time later.
The Sun-Times is not naming the man because he hasn’t been charged with a crime.