A gunman was dead and a man was in grave condition after a shooting Tuesday morning in Humboldt Park on the West Side. Around 6:30 a.m., a 21-year-old man was arguing with someone he knew in the 3700 block of West Grand Avenue when the person pulled out a gun and opened fire, striking the man three times, Chicago police said. He was taken to Stroger Hospital where his condition was described as "grave," police said. The gunman fled in a brown SUV and was later found with a self-inflicted gunshot wound to his head in the 4000 block of West Le Moyne Street, officials said. He was pronounced dead at the scene. No further information was immediately available.