Joseph Robinson, 21, of Irvine was struck by a 2001 Toyota making an unsafe turn near Santiago Canyon Road and Loma Ridge around 7 a.m.
He was pronounced dead at the scene.
Sommer Gonzales, 18, of Tustin fled the scene but was later arrested in Rancho Santa Margarita for felony driving under the influence causing injuries and felony hit-and-run causing injuries.
Gonzales was scheduled to appear in a Santa Ana courtroom Monday.
