Semaj Miller was gunned down the afternoon of July 29 near Main Street and East 87th Place in South Los Angeles.
The 17-year-old suspect, whose name was not released, was arrested last Thursday, according to LAPD.
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Miller's coach Derrick Cooper called him a "superstar basketball player" who had a promising future.
Miller started playing basketball at age 11. He started getting better and better - and kept growing and growing, reaching a height of 6 feet 6 inches by age 14.
He played ball for the Wildcats Youth Academy, which was established to give young people a safe place to learn and have fun.
The L.A. County District Attorney's Office filed one count of murder on a juvenile against the suspect on Monday.