Christopher Wayne Ross (Huntsville Police Department)

A Tennessee 19-year-old who was allegedly drunk when he killed a Huntsville teen in a crash last month had a blood alcohol content level seven times the legal limit, court records show.

Christopher Wayne Ross, 19, was charged with manslaughter and leaving the scene of an accident following the May 29 crash that killed 19-year-old Toniette "Toni" Katherine Piccinich of Owens Cross Roads. On Wednesday, a charge of first-degree assault was tacked on for the injuries sustained by a third driver, Theodore Andrew Jervis.

Court documents indicate that Ross' blood alcohol level that night was .14, nearly twice the legal limit of .08 for a person 21 years old or older. The legal limit for an underage drinker, as Ross was, is .02.

Ross was driving a white Chevrolet Impala at a high speed on Mastin Lake Road the night of Piccinich's death. At Jordan Lane, he ran the red light and smashed into the driver's side of Piccinich's Toyota Corolla.

Toni Piccinich (Contributed photo)

Jervis was seriously injured when the impact of the crash forced Piccinich's car into his.

Police said that after the crash, Ross got out and ran up a nearby hill in an attempt to escape. Two witnesses in another vehicle jumped out, ran after him and detained him until officers arrived.

Ross' mother told AL.com news partner WHNT News 19 that he did not remember the crash. He called his mother around 1 a.m. Saturday to tell her he'd been in an accident.

He faces up to 30 years on the charges of manslaughter and leaving the scene of the crash. The assault charge, a Class B felony, adds another potential 20 years to his sentence if he is found guilty of all charges.