A 9-year-old boy who was badly injured in a Northern California commuter train crash that killed three other people has died, according to a GoFundMe page set up for his family. Julien Nieves of Dixon died Wednesday of injuries suffered when an Amtrak commuter train smashed into a car on June 26 in unincorporated Brentwood, Daisey Morales, who organized the GoFundMe page, wrote Sunday.