UPDATED 07/25/12 11:32 a.m.

CHICAGO (CBS) — A mother has become the second victim of a gang shooting in a Jeffery Manor neighborhood park, which also killed a 17-year-old boy and wounded two others.

As CBS 2’s Susanna Song reports, Janeen Hancock, 34, was pronounced dead at 7:35 p.m. Tuesday at Stroger Hospital of Cook County, about 21 hours after she was shot in Merrill Park, in the 2100 block of East 96th Street.

LISTEN: WBBM Newsradio’s Bernie Tafoya reports

Hancock was shot in the abdomen and chest at 10:18 p.m. Monday along with three others in the park.

Also killed in the shooting was Alixi Johnson, 17, of the 9600 block of South Merrill Avenue. He was shot in the neck, and was pronounced dead at Advocate Christ Medical Center in Oak Lawn.

The shooting also left a 21-year-old man wounded in the abdomen, and a 30-year-old woman wounded in the left leg. They were taken to Stroger and Advocate Christ, respectively, and were both last reported in stable condition.

On Wednesday morning, Marshawn Riley, Hancock’s cousin, was in tears and overwhelmed with pain. He learned of Hancock’s death late Tuesday night.

“I loved my cousin,” Riley sobbed. “She was always smiling; always cracking jokes.”

Hancock, the mother of three children, was out with friends at the park when two people came out of a gangway across the street and started shooting – one with a rifle, the other with a handgun, police said.

“They just came and gunned down everybody,” Riley said.

“One of them had an AK-47,” added Hancock’s grandmother. “You hear about this stuff, and you just can’t rationalize it, I just can’t believe it; I mean, it’s just unreal. She’s here the next minute, gone the next.”

Irma Hancock said she loved her granddaughter’s “mild, gentle ways,” as she showed pictures of Janeen.

Hancock’s family wants justice to be served.

“I just want the people caught, man, whoever did it, let justice serve them,” Riley said.

“They’re just shooting just to be shooting,” added Irma Hancock. “They don’t care who they’re shooting. They just shoot.”

Irma Hancock is now wondering who is going to raise her three great-grandchildren, since their father is not in the picture.

Janeen Hancock’s children were all 10 or younger.

The shooting that killed Hancock and Johnson was one of several Monday night and early Tuesday morning. Nine others were wounded in other incidents.