CHICAGO -- The teenager who attacked Kansas City Royals coach Tom Gamboa on the field was ordered Monday to stand trial in juvenile court.

A date will be set Tuesday for a trial on a felony charge of aggravated battery. The 15-year-old boy, who was not identified, ran onto the field at Comiskey Park with his father at the Royals-White Sox game Thursday and attacked Gamboa.

The teen's attorney, Assistant Public Defender Christopher Swanson, asked the judge to allow the teen to go home with his mother, but the judge ordered him held in a juvenile facility at least until after Tuesday's hearing.

During Monday's hearing, the boy, wearing blue jeans and a black and blue T-shirt, stood quietly. His mother, grandmother and other relatives stood nearby.

Assistant State's Attorney Catherine Gregorovic outlined how the teenager and his father, William Ligue Jr., ran onto the field during the game and ''attacked somebody in front of thousands of people.''

Last Thursday night during the ninth inning, Gamboa, 54, was coaching first, facing the field, when two shirtless men rushed him from behind. They knocked him to the ground, where they continued to punch and kick him.

On Saturday, the teenager's father was held on $200,000 bail. Ligue, 34, faces the same felony charge as his son.

During that hearing, Assistant State's Attorney Colleen Daly described the attack as premeditated and that Ligue had even telephoned his sister, telling her to turn the game on her television because he was going to be on.

It was just a short time after that call, Daly said, that Ligue and his son ran onto the field and attacked Gamboa.

Daly said the father told police he ran onto the field because he was angry that the White Sox were losing.

Ligue Jr.'s sister, Kimberly Richardson told the Chicago Tribune on Sunday she would not bail her brother out of jail and that his actions embarrassed her family.

"I ain't got $20,000 to put up for him," Richardson told the Tribune. "And for what he did, this stupidity? No, he's not getting out of jail."

Richardson told the Tribune that Ligue had been on edge in the weeks before the attack. He had just bought a headstone for his 1-month-old daughter, who died in May, she said.

"Maybe this was a cry out for help from him because there was so much going on in his mind," she said.

Information from The Associated Press was used in this report.