A funeral for the slain honors student was held at Allen Chapel AME Church in southeast Washington.
Music legend Stevie Wonder was among those at the service. He performed a song honoring Sutton.
Sutton's body was found in a wooded area on Sunday, May 10. His family believes he was killed in a dispute over a ride home.
District council member Michael Brown, who attended Friday's funeral, got to know Sutton well when the teen served as an intern in his office.
“A sad day, but a celebration, too,” Brown said.
The council member emphasized that the community can learn from Sutton’s tragic death.
“(He) was doing everything right,” said Brown. “And that's really the scary part about this violence; you can do everything right and still be touched by it. So we just have to do a much better job of embracing our young people.”
Brown told News4 that he is going to work with Sutton's family to make sure that Alonte's life will be memorialized.
One person has been charged with Sutton's death.