|16-year old Raymond Galloway (source)|
After the 16-year old fell asleep, the 13-year old boy got hold of a loaded, unsecured 9 mm handgun and shot the older boy to death.
He later admitted to the shooting.
From an article and news video:
The teen shot his cousin, Raymond Galloway, in the head at around 5:50 a.m. Sunday while Galloway slept in the teen’s bedroom in the 500 block of East 38th Place, according to Chicago police and Cook County prosecutors.
The 16-year-old was pronounced dead about 90 minutes later at Northwestern Memorial Hospital, according to authorities.
The two boys had been arguing earlier about an Xbox, according to a police report.
A fired 9mm cartridge was found in the teen’s bedroom and a 9mm semi-automatic handgun was recovered in the apartment, said Tandra Simonton, a spokeswoman for the Cook County State’s Attorney’s Office.
The 13-year-old told police he shot Galloway, she said. Police said the boy’s mother was present when he made that statement.
The boy was charged as a juvenile with first-degree murder just after midnight Monday. Judge Stuart Katz ordered him held in custody, Simonton said.
It’s not clear where the boy got the gun. No adults have been charged.The article doesn't say where the boy got the gun and ammo.
Every gun in the hands of a child must first pass through the hands of an adult.