Officer Greggory Casillas V, 30, was killed on March 9, 2018, in Pomona, California, after being shot while attempting to arrest a suspect following a vehicle pursuit. The pursuit began when officers tried to stop a vehicle for reckless driving; the driver, identified as Isaias De Jesus Valencia, fled, crashed into another car, and ran into an apartment. As Officer Casillas and his partner approached the apartment to make contact, Valencia fired through the door, striking both officers. Officer Casillas died at a local hospital; his partner survived.

Valencia remained barricaded inside the apartment for more than 15 hours before surrendering. He was charged with the murder of Officer Casillas and multiple counts of attempted murder of a peace officer. At the time of his death, Casillas had served with the Pomona Police Department for six months and was still in field training, after three years as a civilian employee with the department. A stretch of the I-10 freeway in Pomona was later dedicated in his memory as the Pomona Officer Greggory Casillas Memorial Highway.

If anyone has information about the events leading up to the March 9, 2018 shooting or knew Officer Casillas, please share what you know.