OPP say a second person is now dead after a serious crash on Highbury Avenue outside of St. Thomas.

Around 11:40 a.m. Friday, a white Sterling dump truck was traveling northbound on Highbury near Ferguson Line.

The dump truck veered into the southbound lane and struck a black Dodge car.

The dump truck then slammed into a silver Dodge pickup truck.

The driver of the pickup truck, David Guenther, 47, of Bayham, was taken to hospital in critical condition and has since succumbed to his injuries.

The passenger of the pickup truck, Hakeem Krahn, 20, of Malahide Township was pronounced dead at the scene.

Three other people have been treated and released from hospital.

The investigation continues.