Investigators have not determined what led to a 13-year-old boy’s shooting death as he slept inside his family’s Carroll County apartment. It’s possible robbery was a motive. The boy’s PlayStation is missing, police said Tuesday afternoon.

Hours after celebrating his 13th birthday, Nizzear Rodriguez was shot in the head as he slept, around 2 a.m. Sunday, Capt. Chris Dobbs with Carrollton police said. But no motive has been established, and no weapon has been recovered, Dobbs said Tuesday afternoon.

With family members looking on, Malik Davis, 17, of Carrollton, was denied bond at his first court appearance. He was arrested Sunday night in connection with the death of Nizzear, according to Carrollton police.

On Tuesday, police announced that three additional arrests had also been made in the case. Kenneth Wheat, 21, and Jackquline Leann Freeman, 24, have each been charged with murder, Capt. Chris Dobbs said. Investigators believe Freeman acted as the getaway driver, Dobbs said. A fourth suspect, Oleida Ward, 34, of Carrollton, has been charged with making false statements, Dobbs said. Police did not release details about her involvement.

Investigators believe both Davis and Wheat entered the apartment, but may have been in the wrong apartment, Dobbs said. Davis knew Nizzear, but Wheat did not, according to police. It’s not known who pulled the trigger.

“We know that Davis and Kenneth were in that apartment,” Dobbs said.

Davis, the first to be arrested, has been charged with murder, burglary and possession of a firearm after an alleged home invasion at the home where Nizzear lived, according to investigators. Nizzear was shot in the head early Sunday and was found by a relative Sunday morning.

In a courtroom Tuesday afternoon at the Carroll County jail, Davis told Judge Al Johnson that at the time of his arrest, he was already on probation. He is a high-school dropout who should be in the 10th grade, he said.

After the hearing, Davis was led back to jail. He will have his next court appearance on Sept. 15. Relatives declined to speak to reporters outside the jail.

— Please return for updates.