One man was killed and five other persons were injured near Reston Thursday night in a three car collision that tore one vehicle in two and was described by Fairfax County police as "one helluva accident."

Steven D. Urban, 27, of Columbus, Ohio, was turning left onto Reston Avenue from the westbound lanes of Leesburg Pike about 10:30 p.m., when his car collided with another, driven east on the pike at the 55 miles an hour speed limit, police said.

Urban's car was chopped in half. The front end remained at the intersection. The rear end was flung 100 feet away. His body was hurled 30 yards into a culvert. Urban, a marketing employe for Xerox was killed instantly.

"It was one of the worst accidents I've ever seen," said Fairfax County police spokesman Warren Carmichael.

The driver of the eastbound car, identified as Ricky Lee Harlow, 18, of 717 Jonquil La., Herndon, was listed in critical condition yesterday in the intensive care unit of Fairfax Hospital. His 21-year-old brother, Thomas, of 713 Jonquil La., a passenger in the car, was listed in fair condition at the hospital.

Another passenger, Michelle Levandowski, 17, of 2215 Pimmit Dr., Falls Church, was listed in fair condition at Fairfax, according to hospital spokeswoman Nancy O'Shea.

A third passenger in the car, Identified as Tammy Look of Alexandria, was treated for superficial cuts at the Reston Access Hospital and released.

Police said a third car, also eastbound on Leesburg Pike at the time of the accident, grazed the other vehicles. They said the driver, Scott Koven, 17, of McLean, was treated for bruises at the Access Hospital and released.