Dang Tran, 21, is expected to be arraigned on three counts of gross vehicular manslaughter, among other possible charges.
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According to the California Highway Patrol, Tran was driving recklessly and at a high rate of speed on Interstate 880 near the Stevenson offramp Tuesday night when his car caused a chain reaction accident.
Three people were killed, including 39-year-old Noelle Johnson and two young sisters, 14-year-old Christy Limas and her 9-year-old sister Brooke. They were all part of a larger, blended family.
According to the CHP, none of those killed were wearing seatbelts. Johnson's close friend told ABC7 News the family was traveling home to Manteca from a birthday celebration for a 4-year old that included a stop in Santa Cruz.
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Johnson, her boyfriend Chris, and their six daughters were riding in a Cadillac Escalade when it was struck.
One of the children remains hospitalized.
Tran is now expected to be arraigned sometime on Friday. His mother offered no comment outside of court.
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