CHICAGO (CBS) — The Will County State’s Attorney’s Office announced Tuesday that charges were filed in connection to a fatal crash last month in Beecher, killing a pregnant mother and her three sons.

The other driver, Sean B. Woulfe, 25, was charged with 16 counts of reckless homicide — 14 counts of reckless homicide and two counts of reckless homicide of an unborn child.

READ MORE: Thieves Steal Your Identity To Get Rental Cars, And You Get Stuck With The Bills

Twelve of those counts are eligible for extended term [up to 10 years in prison] due to aggravated factors: killing a child under the age of 12, killing more than one person and driving more than 20 miles above the speed limit.

According to the investigation, Woulfe was going 75 mph in a 55 mph speed zone at the time of the incident on July 24. He also blew a clearly displayed stop sign. Authorities said there isn’t any physical evidence of alcohol or drug use, but would not comment on whether texting could be involved.

Woulfe could face up to 10 years in prison.

Lindsey Schmidt, 29, of Beecher and her sons, 6-year-old Owen, 4-year-old Weston and 1-year-old Kaleb were traveling northbound on Yates Avenue when Woulfe, who was traveling eastbound on Corning Road, ran the stop sign and collided with Schmidt’s vehicle in the intersection of Yates and Corning.

The Schmidt family was on their way to bible camp.

READ MORE: Chicago Weather: Another Mild Day

Schmidt and her youngest son Kaleb were pronounced dead at the scene. Weston died the following evening after being placed on life-support and Owen died three days after the crash, after being placed into a medically induced coma.

Woulfe received a traffic citation that was dismissed earlier this month. The Will County State’s Attorney’s Office said, by dropping the ticket, prosecutors were making sure they can file more serious charges later, by avoiding possible double jeopardy if the driver were to plea on the citation first.

Woulfe was taken into custody on Tuesday morning, and is currently being held with bond set at $1 million.

Woulfe made his first court appearance on Wednesday morning and pleaded not guilty. He was seen wearing a red Will County Jail jumpsuit, while in a wheelchair.

His attorney asked the judge on Wednesday to reduce Woulfe’s bond. The hearing has been set for Friday.

MORE NEWS: 6-Year-Old Girl Shot On West Englewood Porch, Suffers Graze Wounds

His arraignment is scheduled for Sept. 14.