The investigation into what caused or contributed to a single-vehicle crash that killed an off-duty Lawrence Police officer early Wednesday could take several weeks, according to Lt. Josh Kellerman, spokesman for the Kansas Highway Patrol.

Officer Matthew Edward Klock, 29, was killed when his personal vehicle hit a traffic signal pole near the intersection of Sixth Street and Wakarusa Drive around 2:15 a.m., according to the KHP, which is investigating the case.

According to the KHP report, Klock’s 2012 Nissan Altima was heading east on Sixth Street when his vehicle went through the intersection at Wakarusa Drive, crossed the center line and struck a light pole in the center median of Sixth Street.

Klock — who was the only person in the vehicle and was dead at the scene — had been a member of the Lawrence department since 2007.

The KHP report says Klock was not wearing a seat belt when the crash occurred. Kellerman said the KHP will have more to release after an autopsy and toxicology reports are complete, but he did not have a time estimate for how long that could take.

Kellerman said he could not say whether or not alcohol was a factor in the accident.

Lawrence Police Sgt. Trent McKinley said the death of Klock — whose family lives in the Derby area — has had a deep effect on the police department and the law enforcement community.

“This is his extended family,” McKinley said.