SALEM, Ore. — The semi-truck driver involved in a deadly Oregon crash that killed seven people and injured four others on Interstate 5 in early May was indicted by a grand jury Tuesday on charges of manslaughter, according to court records.

A grand jury in Marion County Court indicted Lincoln Clayton Smith, a 52-year-old from California, on 12 counts, including seven charges of manslaughter. The grand jury also indicted Smith on charges of assault, reckless driving, and driving under the influence of intoxicants.

The May 18 crash is one of Oregon’s deadliest highway crashes after seven farmworkers were killed when the 18-wheeler Smith was driving veered off the highway, striking a passenger van and another parked semi-truck.

While Smith’s court appearance Tuesday morning was brief, family members and coworkers of the victims filled the courtroom. Smith was being held without bail in Marion County Jail, according to the sheriff’s office website.

All 11 people killed and injured in the crash were contract farmworkers for J. Ruiz Farm Labor Contracting. They had been working in a sugar beet field outside Albany, Oregon, and were on their way home for the day, said administrative manager Anmarie Ruiz.

Ruiz said the devastation from their loss is “immeasurable.”

California car crash:One dead, 10 injured including children ages 3 to 8, after car crashes into tree in California

Semi-truck driver was under the influence, court documents allege

Smith allegedly was under the influence of a controlled substance and an inhalant, according to charging documents.

At his arraignment on May 19, authorities said Smith had refused a field sobriety test. He was also unable to focus and answer basic questions. A district attorney said Smith admitted to taking speed the day before the crash and was in possession of methamphetamine.