A motorcade and dozens of police officers lined the entrance of Citrus Elementary School in Upland, California, to welcome the son of a slain officer on his first day of kindergarten on Aug. 29.
According to prosecutors, suspect Isaias De Jesus Valencia was hiding in an apartment building before firing a gun through the door at the police, reported NBC. Casillas was killed, while another officer was hit and survived. Valencia was charged with murder and could face the death penalty.
“It was our privilege to escort Greggorio Casillas, son of our fallen Officer Greggory Casillas, on his first day of kindergarten. The Casillas family will never be forgotten and they are part of a law enforcement family that will always be with them,” wrote the Pomona Police Department on a Twitter post.
It was a touching tribute to 30-year-old Officer Casillas, who left behind his wife and two children.
“It brings tears to my eyes. Poor baby boy,” wrote Twitter user @RaideretteQT, who also posted video of the event.