Prosecutors formally charged a 17-year-old Kent youth as an adult with 2nd-degree murder Wednesday afternoon for allegedly shooting to death a 16-year-old boy at a backyard barbecue in Auburn May 22.

James Mills is scheduled to be arraigned June 6 at the Norm Maleng Regional Justice Center in Kent. The King County Medical Examiner has identified the victim as 17-year-old Adrian Wilson.

Prosecutors also have charged Wilson’s father, 46-year-old Gabriel Wilson, with first-degree assault for firing shots during the melee.

Auburn Police Detective Michelle Vojir’s account, the basis for the charge against Mills, runs as follows:

On May 22, 911 received multiple reports of shots fired at the Aspen Meadows Apartments at 402 21st St. SE. Police responded and found Adrian Wilson on the ground in front of apartment No. 45, dead.

According to what witnesses told police, Adrian Wilson and his family were attending a community barbecue that afternoon in the common area of the complex.

Shortly before the shooting, Corey Branham, who lived in apartment No. 42, showed up with Mills, who had a gun.

After a few minutes, Adrian Wilson confronted Mills about the weapon, according to the police account. He was walking toward Mills when Mills pulled out the weapon and fired, hitting Wilson once in the head, according to the police account.

Branham told police he ran into his apartment, and, when he looked out a short time later, saw people around the fallen Wilson.

Medics later transported two other young men, Steven Chehey and Robert Carro-Aguilar, to Harborview Medical Center with life-threatening gunshot wounds, according to the police account.

Branham and other witnesses identified Mills as the person who had fired the fatal shot, and police began to search for him, according to the police account. From 5 p.m., May 22 until 10 p.m., May 23, Auburn Police Department officers and detectives followed leads to track down Mills.

At about 10 p.m., two officers arrived at the apartment of Mills’ mother in Kent and watched as a thin, black female wearing sunglasses approached the apartment door and knocked. When officers walked up to the female, she took off her purse, sunglasses and wig. When officers realized that it was Mills, they arrested him.

According to the police account, Mills told officers that he had brought the gun to the apartment complex to protect his girlfriend’s mother. He told officers that the woman had issues with Adrian’s father, Gabriel Wilson, whom Mills called “a bully.” Mills told police, according to the account, that he thought Wilson’s group was trying to provoke a fight by hosting the barbecue directly outside the woman’s apartment.

According to the police account, Mills said he had known that there was going to be trouble when he set out that afternoon, but he hadn’t been afraid. Vojir then asked Mills why, if he knew there was going to be trouble, he didn’t simply leave?

“I’m not gonna run away from my problems,” Mills responded, according to the police account. “I’m not getting punked, not gonna intimidate me. I’m gonna stay right there and do what I planned to do.”

According to the police account, Mills police that when Adrian Wilson and his brother walked up to him and started calling him names, he pulled the gun out of his waistband and fired two shots.

Mills said he ran away and ended up at his brother’s house. He said that the gun, a .9 mm pistol, was still there, although police have been unable to find it.

The Medical Examiner performed the autopsy on Wilson on Monday and determined that he had died of a single gunshot wound, which had entered his chin and lodged in his spinal cord.

According to the police account, Mills is a documented member of the Marvin Gangster Crips, an established criminal street gang, and Gabriel Wilson is a documented member of the Nortenos, a criminal street gang based in northern California. There is no known rivalry between the Nortenos and the Marvin Gangster Crips, Vojir wrote, but “beefs,” she noted, often result from direct contact and confrontations between gangs.

“The presence of gang members of unrelated gangs set together in one place is a volatile situation requiring the members to adequately represent themselves before their peers. This situation would normally lead to gang member arming themselves before expected contact with members of the other gang set,” Vojir wrote.

Mills was convicted in 2010 as a juvenile of second-degree assault and second-degree robbery Because he fired multiple shot in this incident, prosecutor’s expect to file additional charges.

Prosecutors asked for $1 million bail for Mills.