One person is dead and another is listed in critical condition following a head-on crash in Schuylkill County on Thursday morning.

State police at Schuylkill Haven said the crash occurred at 10:23 a.m. on Route 209 in Port Carbon.Troopers said George R. Stevenson, 83, of Pottsville, was driving a 2010 Chevrolet HHR westbound while James F. Garland, 70, also of Pottsville, was driving a 2010 Buick Lucerne eastbound.Troopers said Stevenson was overcome by an unknown medical condition causing his vehicle to enter the eastbound lane and collide head-on with Garland's vehicle.Both drivers had to be extricated from their vehicles by rescue personnel. Stevenson was flown by MedEvac helicopter to the Lehigh Valley Hospital, Cedar Crest, where he was pronounced dead. Garland was flown by LifeFlight helicopter to the Reading Hospital with major injuries.The investigation into the crash is continuing.