12:28 PM ET

A 5-year-old girl was seriously injured when a pickup truck driven by the former Kansas City Chiefs assistant coach hit two stopped cars on an interstate entrance ramp.

The trial of the son of a coach had been scheduled for September. He was facing up to seven years in prison, but the plea deal means he could be sentenced to four years in prison. He entered his plea in a Kansas City court. October 28th is when the sentencing will take place.

According to investigators, the driver of the Dodge truck that hit the cars on the entrance ramp to the freeway was drunk and driving at a high rate of speed.

A girl was in one of the cars. People were injured in the crash.

He admitted in court that he drank on the night of the crash.

"I'm really sorry for what I've done," he said. It was a huge mistake. I'm sorry to the family. I was not intending to hurt anyone.

The plea deal was opposed by the attorney for the family.

Five victims of the crime are angry. The prosecuting attorney doesn't want the maximum sentence allowed by law. A 5-year-old girl was in a coma and three other people were injured because of the actions of the previous offenders.

According to court documents, a police officer who arrived at the scene of the crash reported smelling alcohol and seeing bloodshot eyes. Two hours after the crash, he had a blood- alcohol level of 0.113. There is a legal limit.

One of the vehicles he hit was stuck because of a dead battery and the other was owned by the woman who came to help.

In November, the Chiefs reached a confidential agreement with the family to cover their medical expenses.

Emergency surgery was needed for a groin injury. After his contract expired, the Chiefs placed him on administrative leave.

In 2009, after a series of run-ins with law enforcement, he graduated from a drug treatment program in Pennsylvania. The Philadelphia Eagles were coached by his father.

After he was arrested on drug-related charges, his brother was sentenced to two years in a Pennsylvania drug program. In August 2012 he was found dead in his dorm room at Lehigh University, where he was working at the Eagles training camp. He died of a heroin overdose, according to the coroner.