A Delaware County grand jury indicted the Columbus truck driver accused of killing a family of three on Interstate 71 on an eighth charge.

Modou Ngom, 50, was indicted Sept. 17 on an additional count of vehicular assault, according to Delaware County Common Pleas Court documents first reported by WBNS. The new count adds to three charges of aggravated vehicular homicide and four charges of vehicular assault Ngom already faced.

The charges stem from an April 11 crash near the U.S. 36 and state Route 37 interchange in Delaware County, near the Tanger Outlets Columbus mall. The interchange sits along a stretch of I-71 heavily traveled by Powell and Liberty Township commuters. The Ohio State Highway Patrol's (OSHP) preliminary investigation found Ngom failed to stop his Freightliner semi while approaching backed-up traffic in a construction zone.

Nine vehicles were involved. Luke Soposki, 37, his wife Lynnea Soposki, 36, and their 1-year-old son Logan were killed, NBC4 reported. Three other people were taken to nearby hospitals with serious but not life-threatening injuries.

Video obtained from the Ohio Department of Transportation through a public records request showed a white semi in the far right lane crashing into slow-moving vehicles. At least one vehicle burst into flames on impact, and the semi drove into the median, pushing at least two other vehicles with it.

Ngom pleaded not guilty to those seven charges.

In the weeks after the crash, the Ohio Department of Public Safety (DPS) uncovered what it called conflicting information about Ngom's identity in state and federal records. The department said Ngom appeared to have entered the United States in the 1990s and used multiple names and dates of birth to obtain identification.

Evidence indicated he fraudulently obtained an Ohio driver's license around 2003 and a commercial driver's license in 2007 under an alternate identity, DPS said. He was naturalized as a U.S. citizen in the mid-2010s under that same alternate identity before changing his name back to Modou Ngom in 2015.

DPS Director Andy Wilson directed state investigators to turn the identity-fraud findings over to U.S. Immigration and Customs Enforcement Homeland Security Investigations. The U.S. Attorney's Office for the Southern District of Ohio and the Delaware County Prosecutor's Office were also notified.

The Soposki family's estate filed a wrongful death lawsuit against Ngom in Delaware County Common Pleas Court in May.

Ngom was scheduled to be arraigned on the new charge Tuesday, Sept. 22. A jury trial was also set to begin that day, according to WBNS.