(STMW) — Four people were killed and at least 21 others, including a 13-year-old boy, have been wounded in shootings across Chicago since Friday afternoon.

The most recent fatal shooting occurred Sunday afternoon in the Chatham neighborhood on the South Side.

About 12:15 p.m., the 25-year-old man was standing outside in the 0 – 50 block of East 88th Street when a white van pulled alongside and someone inside opened fire, police said.

He was shot three times in the abdomen and was taken to Stroger Hospital, where he was pronounced dead at 12:49 p.m., according to police and the Cook County medical examiner’s office. His name was withheld Sunday afternoon pending notification of his family.

Early Saturday, a man was shot and killed in a botched robbery in the Lake View neighborhood on the North Side.

Kevin O. O’Malley was shot twice in the chest about 2 a.m. in the 900 block of West Oakdale, officials said. O’Malley, of the 10600 block of Palos West Drive in Palos Park, was pronounced dead at the scene, the medical examiner’s office said.

Kristopher K. Pitts, 22, was charged with first-degree murder and armed robbery with a firearm in connection with O’Malley’s shooting, police said.

An officer at the scene said the shooting might have stemmed from an armed robbery for a cell phone.

Pitts, of the 1100 block of North Central Park, was ordered held on bond Sunday.

Two hours earlier, a man was shot to death in the Little Village neighborhood on the West Side.

About midnight, 24-year-old Jose Velasquez was walking with his spouse in the 2100 block of South Fairfield when two or three people walked up to them from a gangway and opened fire, authorities said.

Velasquez, of the 2800 block of West 21st Street, was shot in the back and taken to Mount Sinai Hospital, where he was pronounced dead at 1:41 a.m., authorities said.

A 19-year-old man was fatally shot early Saturday in the South Shore neighborhood.

About 1:25 a.m., the man was shot in the head in the hallway of a building in the 6800 block of South Ridgeland, police said.

He was taken to Northwestern Memorial Hospital, where he was later pronounced dead, the medical examiner’s office said.

A 13-year-old boy was critically injured Saturday afternoon in a Homan Square neighborhood shooting on the West Side.

The boy was in the passenger seat of a van in the 3200 block of West Lexington when someone fired shots from a red SUV about 2:45 p.m., police said.

Family members drove the boy to Stroger Hospital, where he was listed in critical condition, police said.

The most recent nonfatal shooting happened Sunday afternoon in the Gage Park neighborhood on the Southwest Side.

A 42-year-old man was walking about 2:20 p.m. in the 5400 block of South Albany when a gunman approached him from behind and opened fire, striking the man in both legs and back, police said.

He was taken to Mount Sinai Hospital, where his condition had stabilized, police said.

At least 19 others have been shot in Chicago since Friday afternoon.

Additionally, a 43-year-old man was fatally stabbed in a Pilsen neighborhood bar early Saturday, police said.

About 12:40 a.m., Rodolfo Avina was stabbed in the neck while he was in a bar in the 900 block of West 18th Street. Avina, who lived in the 700 block of North Franklin, was dead at the scene, authorities said.

Ulises Almaraz, 29, of Berwyn, faces one count of first-degree murder in connection with the death, Chicago Police announced early Sunday. He is scheduled to appear in court Sunday.
(Source: Sun-Times Media Wire © Chicago Sun-Times 2015. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)