GRAND RAPIDS, Mich. (WOOD) — The 15-year-old accused in the murders of two southwest Michigan men in Knoxville, Tennessee turned himself in on Sunday morning, police say.

Rico Cook faces charges of first-degree murder, attempted first-degree murder and especially aggravated robbery, according to the Knoxville Police Department.

Police had been looking for him since he and a 17-year-old suspect allegedly shot three people inside a vehicle in the parking lot of an apartment building on Thursday afternoon.

Two of the victims, 18-year-olds Sergio Rivera and Jaloen Morris of Decatur, Mich., were killed.

Police said the injuries of the third victim, a 16-year-old from Knoxville, were not life-threatening.

Investigators say Rivera and Morris traveled from Decatur to Knoxville to conduct a deal for high-grade marijuana.

The other suspect, Deon Nolbert, was also arrested on murder,  attempted murder charges, and especially aggravated robbery charges.