A 21-year-old semi-truck driver charged with three counts of vehicular manslaughter in connection with the highway deaths of three people in Ontario, hung his head throughout most of his court appearance on Tuesday -- a pre-preliminary hearing ahead of a Nov. 6 preliminary hearing.

Jashanpreet Singh, of Yuba City, was originally charged with driving under the influence of drugs, causing bodily injury, and gross vehicular manslaughter while intoxicated for the Oct. 21 incident , but those charges were later amended as his toxicology results came back negative for drugs or alcohol.

Jashanpreet Singh CBS LA

The San Bernardino County District Attorney's Office said in an Oct. 31 news release that, "Toxicology reports confirmed none of the substances tested were present in the def

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