The runner who died in Sunday's half-marathon was Charles Whitmore Riske of Costa Mesa, the Los Angeles County Coroner's office told NBC LA on Monday.
Riske, 37, had been running for two hours when he collapsed on Olympic Boulevard during the Rock 'n' Roll half marathon on Sunday. He died soon after.
An autopsy has not yet been performed, coroner spokesman Ed Winter said Monday, and the cause of Riske's death has not yet been determined.
About 15,000 runners and walkers participated in the half-marathon, which began and ended at L.A. Live.