ST. LOUIS • For the third time in six months, a stretch of Interstate 55 in south St. Louis was the scene of a deadly shooting on Monday.

Police closed down the interstate for roughly three hours while they collected evidence and removed the body of an unidentified man who appeared to be in his late 20s, police said.

Witnesses said a dark colored vehicle, possibly a four-door sedan, was following a black Ford pickup. The pickup, which was occupied only by the driver, was trying to get away.

According to witnesses, the shooter was riding in the back seat and began shooting just south of Arsenal, said St. Louis police Capt. Mary Warnecke. The shooter and driver were the only ones in that vehicle. One of them wore a black hoodie.

The pickup crashed after the driver suffered gunshot injuries. He was pronounced dead at the scene. Warnecke said she did not know how many times the driver was shot. There was no indication that the pickup driver returned fire, she said.

The rear window of a gold Ford Explorer, which was not involved in the pursuit, was shot out. The driver of that vehicle was not injured.

The car carrying the killer drove off after the pickup crashed.