he says his 53-year-old mom sherry hicks and his step dad were visiting from santa barbara. they were walking home from starbucks wrapping up what he describes as a wonderful day. it should be a great day, first time i saw my mom in three months since i graduated coll e college. reporter: but just a block from home the unthinkable happened. police say 53-year-old hossein tabrizi drove his truck up on to the sidewalk striking hann s mother and his 23-year-old wife shane hahn. he was speeding. he came directly at us. there was no time to move, and i saw his eyes before he killed my mom. reporter: while it s unclear what led to the crash, nbc bay area has learned tabrizi has been in trouble before. he was convicted of dui in 2005 and of being drunk in public that same year. he was also convicted of petty theft in 2007 and now he faces vehicular manslaughter charges. i hope there s some justice in this world, and i hope he can understand my suffering, hoping to understa