Endia Martin, killed after a feud with a long-time friend, in photos posted to her Facebook page.
Chicago: A feud between two long-term friends, which was carried out in part on Facebook, ended in bloodshed when one of the 14-year-old girls opened fire with a stolen gun, fatally shooting her one-time friend and wounding another girl, authorities say.
"They was all into it," said Lauren Joseph, 29, who witnessed the after-school confrontation outside her home on Monday. Ms Joseph said she was a cousin of Endia Martin, who was killed. "They said it was about some boy, but we don't know the whole story," she said.
An honours student charged in connection with Endia's death appeared in juvenile court on Tuesday, licking her lips nervously and softly answering questions from a judge. She has not been identified because she is a juvenile.
Endia Martin, 14, in a photo posted to her Facebook page.
A different portrait of the suspect emerged on Monday from her social media activity.
"Bout to beat some a-" the girl tweeted about two hours before the fatal confrontation, which took place in the Back of the Yars neighbourhood. She also posted a photo on Facebook of herself sticking out her tongue and holding up her middle finger. The photo was captioned: "I Don't Chase Em ' I RePlace 'Em."
On Tuesday night, police charged a second offender, a 17-year-old boy, on aggravated unlawful use of a weapon and other charges for allegedly trying to discard the murder weapon, a .38-calibre handgun. Earlier on Tuesday, police Superintendent Garry McCarthy hinted to reporters that a 24-year-old uncle of the suspect also was being questioned for giving the gun to the girl, knowing "there was going to be a fight," he said.
According to Ms Joseph, the suspect was a long-time, close friend of Endia, but the two had a recent falling out. They were supposed to meet up Monday afternoon to work it out, she said.
Endia was with friends on the front porch of Ms Joseph's residence when the suspect and her group approached, Cook County prosecutors said.
The suspect produced the gun and pulled the trigger, but the gun "malfunctioned," said Assistant State's Attorney Kathleen Kain. The girl handed the gun to others in her group who quickly fixed it. The girl raised the gun again and opened fire, killing Endia and striking a 16-year-old girl in the upper left arm.
Several witnesses identified the suspect as the shooter, Ms Kain said, and she gave a videotaped confession.
After Kain called the suspect "a danger to the public and herself," Judge Stuart Paul Katz ordered her held in custody.
The suspect's attorney, Elizabeth Tarzia, an assistant public defender, said the girl was on the honour roll at John Hope College Prep High School, played on a school basketball team and was a student leader. She had never been arrested before, Ms Tarzia said.
No one from the girl's family attended the court hearing.
At a news conference outside police headquarters, Superintendent McCarthy said the gun used to kill Endia had been stolen from a car April 14.
"What would have been, under any other circumstance, probably a fistfight between 14-year-old girls because they were fighting over a boy turned into a murder," he said. "You introduce a firearm and you have a murder."
Superintendent McCarthy said he was frustrated by Chicago's persistent gun violence and decried how Illinois gun laws facilitate the illegal flow of weapons onto city streets. He said the gun had legally been left in the owner's car, a practice he described as "insanity".
"Those guns need to be in lock boxes, in safes, in people's residences or on their person," he said.
"No place in Chicago is safe for teenagers nowadays," Endia's stepfather Kent Kennedy said on Monday night outside Comer Children's Hospital, where Endia was pronounced dead.
Mr Kennedy described his 14-year-old stepdaughter as a "beautiful, nice spirit, active in sports. She loved music, loved to dance ... No child needs to be gunned down like a dog in the street. Nobody, period," he said.
So far this year, at least 58 children ages 16 or younger have been shot in Chicago, two more than at this point in 2013, according to an analysis by the Chicago Tribune newspaper.
On Tuesday night, nearly 100 teenagers and residents gathered at the scene of Endia's shooting, to mourn her death and comfort one another.
Chanell Rush, 16, said she met Endia as a cheerleader in fifth grade at Dewey Academy. They were friends ever since.
"That was my baby and I love her," she said, wiping away tears. "She was a good dancer. She was sweet-hearted. She was a good friend."