Family and friends of Darius Jones gathered at First Baptist Church in Pittsburg.
The speakers included De La Salle head basketball coach Frank Allocco and ABC7's Dan Ashley.
Ashley met Jones a couple of years ago while doing a story about Friends of Camp Concord, his charity effort that sends deserving kids to summer camp.
Jones lived in Pittsburg but attended De La Salle in Concord. He collapsed while playing basketball in a youth league.
Authorities are still waiting for autopsy results to determine exactly why he died.