Tito Rodriguez, 28, killed in motorcycle crash on Dan Ryan Expressway in Chicago on July 20.

A mistake turned fatal Sunday afternoon on the Dan Ryan Expressway, when a driver cut off an off-duty police officer who was riding a motorcycle.

CBS 2’s Dana Kozlov reports 28-year-old Officer Tito Rodriguez – who was a new recruit still serving as a probationary officer, with less than 18 months on the job – was heading south on the Dan Ryan near 69th Street when he collided with a car.

Rodriguez’s childhood friend and roommate Roger Steele was shattered by his loss.

“He was just honest, loyal, beyond dependable,” Steele said.

Illinois State Police said 50-year-old Donald Anderson was driving a 2007 Pontiac coupe and was trying to make a sudden lane change to exit the Dan Ryan at 71st Street, when he cut off Rodriguez.

Rodriguez was unable to avoid hitting the back of the Pontiac, and slid at least 40 feet on the pavement after the collision. State police and witnesses said he was not wearing a helmet.

“He did not have on a helmet, and it was two other gentlemen on a motorcycle with him – that was on different motorcycles – and neither one had on helmets,” witness Tracy Johnson said.