Montegut, La. - Police say an 18-year-old man was killed and two teens were injured after a vehicle lost control and landed in Bayou Terrebonne early Sunday morning.
The accident happened shortly after midnight.
Investigators say a 1997 Mercury Grand Marquis, driven by 18-year-old Justin Naquin of Chauvin, was traveling south on LA 55 around mile post 8.8 in Montegut.
Police say evidence at the scene indicated the Grand Marquis was traveling at a high rate of speed when it entered a right curve on LA 55, lost control and crossed the center line leaving the roadway onto the northbound shoulder.
Investigators say Naquin then attempted to re-enter the roadway while braking, causing the vehicle to slide across the north and southbound lanes of LA 55. Naquin's vehicle then left the roadway across the southbound shoulder where it entered a grassy area and began to rotate counter-clockwise.
The Marquis struck a dock and then rolled over onto its roof as it landed in Bayou Terrebonne and sank.
The front seat passenger, a 16-year-old female, was able to escape the vehicle through an open window and swam to safety. She was later transported to Terrebonne General Hospital where she was treated for her injuries and released for minor injuries.
The back seat passenger, a 15-year-old female, remained trapped in the submerged vehicle until she was pulled to safety by rescue personnel. She was transported to Terrebonne General Hospital with life threatening injuries.
The driver, Naquin, was pronounced dead at the scene.
Police say no one in the vehicle was wearing a seat belt at the time of the crash.
Alcohol and speed are suspected to be factors in the crash and routine toxicology tests are pending for Naquin.