Watts was behind the wheel of a bus carrying a group of mostly elderly Hmong and Mien immigrants from the Sacramento area to a casino in October 2008 when the bus veered off a rural Colusa County road and rolled over.
Authorities say Watts apparently dozed off at the wheel, leading to the crash.
Prosecutors say the 53-year-old Watts will have to serve 85 percent of his sentence, making him eligible for parole when he's 75.
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