As police announced yesterday that two teenagers had been charged with first-degree murder in the shooting death of a 13-year-old Greenbelt boy, Ebony Wimbush sat on the hillside where Carlton Francis "C.J." Brown II died in her arms, and she wept.

"People don't realize how it feels," said Wimbush, a high school sophomore who said she tried to use cardiopulmonary resuscitation on the eighth-grade honors student and altar boy.

Witnesses said C.J. was beaten and shot in the abdomen at point-blank range on Friday by two youths believed to have mistaken him for a member of a rival group.

Police charged Jarreau Newton, 16, with first-degree murder and use of a handgun in the commission of a crime. Nicholas Terrebrood, 17, also was charged with murder. The two New Carrollton youths will be tried as adults, police said.

Meanwhile, Wimbush joined C.J.'s father, sister, younger brother and more than a dozen friends to grieve at the site where the St. Bernard's Catholic School student was killed.

"He wasn't involved in it, he was just standing there," Wimbush said. In a voice cracking with emotion, she told of how C.J.'s decision to be a spectator proved fatal.

Students were coming home from school about 4:30 p.m when word spread quickly that a clash between feuding groups of Roosevelt High School students was brewing at Hanover Parkway and Mandan Road. C.J.'s family lives across the street at the Glen Oaks apartments.

Out of curiosity, C.J., Wimbush and about 30 youngsters gathered atop a knoll to watch. When one of the fighters pulled out a gun, the spectators scattered, but C.J. apparently didn't move fast enough, numerous witnesses said.

"C.J. slipped running down the hill," Wimbush said. "I was right behind him."

Horrified, she watched as one youth grabbed C.J. and began hitting him, she and others said. "Then {another} walked up on C.J. and shot him," she said.

He was taken to Prince George's Hospital, where he was pronounced dead.

Yesterday, a bouquet of flowers marked the spot where C.J. fell. All morning, school friends and their parents stopped by the site to comfort the relatives who sat in a tearful vigil.

"I'm sad, and I'm hurt," said C.J.'s father, Carlton Brown Sr., wiping away tears. "My son's life is wasted. He had everything going for him."

News of the killing also drew Andrella Graham Williams to commiserate with the family. Her son, Warren Emmanuel Graham, 17, has been charged as an adult with assault with intent to murder a teacher who was shot in a Largo High School boys room last month.

"God is sending a message to these parents," she told C.J.'s father, who said he was moved by her words. "You can do the best you can do for your children, but crime is everywhere, and you have to be ready, willing and able to get involved. We have to be concerned about our neighbors' children as well as our own."

By all accounts, C.J. was a gifted student who excelled in math and sports. He would have graduated with honors on June 3 from St. Bernard's in Hyattsville.

"He was cool. Everybody liked him," said his older sister Myka, 16. C.J.'s friends described him with words such as "playful," "smart," "happy" and "popular."

Twelve-year-old Lawrence Brown recalled that his brother was always concerned about looking sharp. "He would get all dressed up just to do the dishes," Lawrence recalled with a smile.

The family plans a memorial service for Wednesday at St. Bernard's Catholic Church in Riverdale. In C.J.'s honor, some of his friends said they plan to silk-screen C.J.'s photograph on T-shirts bearing his school football team number, 32.

"I want people to realize what they took away from us," Wimbush said. "They couldn't get the person they wanted, so they got C.J.

"We're going to miss him."