A 20-year-old man was pronounced dead this morning after being shot on the Southwest Side, officials said.

The man was walking with another man on the 5400 block of South Mozart Avenue in the Gage Park neighborhood at about 11:54 a.m. when a van appeared, said Chicago Police Department News Affairs Officer John Mirabelli.

As the van drove by, people from the van and the two men exchanged gang slogans and gang signs, said Mirabelli. Someone from the van then opened fire with a gun, striking the victim, Mirabelli said.

Only one of the men was struck, Mirabelli said, and he was then put into a vehicle en route to a hospital.

Fire officials said they responded to the 6100 block of South California Avenue where the vehicle had stopped and the man was pronounced dead at the scene, said Larry Langford, a Chicago Fire Department spokesman.

The man was later identified as Steve Oppelt-Hollendeck of the 3600 block of West 56th Street, according to a spokesman for the Cook County medical examiner's office.

No one was in custody, officials said.

chicagobreaking@tribune.com