DOVER — A 77-year-old Millsboro man is dead after a head-on collision with a Delaware State Police trooper’s vehicle on Del. 1 Thursday evening.

State police said the accident happened around 5:56 p.m. Thursday as Daniel J. Gates was driving a 2010 Chevrolet Aveo northbound in the southbound lanes of Del. 1. A 22-year-old trooper assigned to Troop 3 in Camden was driving a fully marked 2012 Chevrolet Caprice southbound in the left lane of the highway near Exit 98 when the two vehicles hit head-on.

Mr. Gates, who was not properly restrained, was pronounced dead at the scene. A family dog also died.

The Millsboro man, who was not properly restrained, was pronounced dead at the scene. A family dog also died.

The trooper, properly restrained, was airlifted by Delaware State Police Aviation to Christiana Medical Center where he was admitted with non-life-threatening injuries. He has been released.

The State Police Collision Reconstruction Unit is continuing to investigate. Alcohol does not appear to be a contributing factor.

Southbound Del. 1 was closed at Exit 104 for four hours while the crash was investigated and cleared.