The Okaloosa County Sheriff's Office is investigating the cause of a crash around 3:30 Friday morning at the intersection of Highway 98 and Mary Esther Boulevard.

A driver for Rockey Moving and Storage Company out of Killeen Texas was critically injured when his tractor trailer truck went through the intersection and struck a concrete wall.

28-year old Tyshon Jammar, Jr. of Killeen Texas was flown by medical helicopter to Sacred Heart Hospital in Pensacola.

Investigators say alcohol is believed to be a factor in the crash but the investigation is continuing.