Two St. George residents were killed Friday in separate wrecks in upper Dorchester County.

Shortly before 6 a.m., a 21-year-old man driving a pickup truck north on U.S. Highway 15 was speeding when he hit a curve, causing him to run nearly 300 feet off the road. The vehicle flipped three or four times while attempting to correct, according to Dorchester County Coroner Chris Nisbet.

The driver, identified as Harold James Jennings Jr., wasn't wearing a seat belt and was ejected from the vehicle, Nisbet said.

He was transported to Medical University Hospital, where he was pronounced dead from blunt force trauma to his chest, Nisbet said.

A second wreck happened just after 11:30 a.m. near the fork of U.S. Highways 78 and 178, Nisbet said.

Mary Willingham Carter, 73, was driving a sedan on U.S. 78 heading toward St. George. She was entrapped when the car ran off the highway and hit a tree, Nesbit said. She was wearing a seat belt.

She was transported to Trident Hospital, where she was pronounced dead from head and chest trauma.

S.C. Highway Patrol is handling the investigations.