Minneapolis, MN (KROC-AM News) - Authorities say a Minnesota truck driver was watching a pornographic video on his cellphone when he caused a deadly traffic wreck in a construction zone last year.

A criminal complaint has been filed in Hennepin County Court charging 47-year-old Tate Doom of St Paul Park with one count each of criminal vehicular homicide and criminal vehicular operation. He was arraigned Monday.

According to the criminal complaint, Doom was driving a semi-truck on I-94 in Rogers in October when he slammed into the rear of a trailer that was being pulled by a pickup truck. The trailer broke loose and struck and killed a worker in the construction zone. A co-worker was seriously hurt when he was hit by debris from the wreck.

Investigators determined Doom’s truck was doing 72 mph when it hit the trailer, which was being pulled at 50 mph.

They examined Doom’s phone and learned he had deleted porn videos after the wreck. They were recovered and it was determined Doom was watching one of the videos right before the crash.

News Update: A Mayo Clinic ambulance paramedic was assaulted Monday by a teenager who was apparently under the influence of alcohol and drugs.