A woman was killed in a crash involving a jackknifed semitruck on the 210 Freeway in Irwindale, authorities said.
A man who previously pleaded guilty to driving into a group of law enforcement trainees in Whittier, killing one, withdrew from the plea deal.
Police are now offering a $50,000 reward for information the driver.
Police are searching for a hit-and-run driver accused of crashing into a car in Playa del Rey, killing a man and his 1-year-old baby nephew, and leaving two others seriously hurt.
The Finish the Ride/Finish the Run event promoting road safety paid tribute to Regan Cole Graham, a pregnant cyclist killed in a Playa del Rey crash.
A 9-year-old boy was fatally struck by a private school bus in New York City on Friday morning.