pOne officer was killed and another seriously injured in Pomona, California, on March 9 after shots rang out while responding to reports of a “reckless vehicle,” later leading to a multiple-hour standoff between the suspect and police.ppPomona Police Chief Michael Olivieri confirmeda that Officer Gregory Casillas had been shot and killed in the incident, leaving behind a wife and two small children.ppLaw enforcement officials were later able to apprehend the suspect, ending a 15-hour long standoff.