Manny Hendrix, a former University of Utah basketball player, intercepted a Jim Harbaugh pass and returned it 34 yards for a touchdown with 39 seconds remaining Monday night to seal the Dallas Cowboys' 17-9 exhibition victory over the Chicago Bears.

Harbaugh, the Bears' third quarterback of the night, scrambled to the left under pressure and threw a short pass intended for Eric Starr. Hendrix, a cornerback, picked it off and sprinted into the end zone to seal the triumph for Dallas, which improved to 2-1 in preseason play.Chicago, 1-2, rolled up 412 yards to 234 for the Cowboys but turned the ball over six times with two interceptions and four lost fumbles. Dallas had no turnovers.

Dallas, which trailed 9-6 at the half despite a 54-yard scoring run by Herschel Walker, took the lead after capitalizing on an interception by Victor Scott.

Scott picked off a Mike Tomczak pass midway through the third quarter and returned it 25 yards to midfield. Backup quarterback Danny White threw for 21 yards to Ray Alexander to set up a 47-yard field goal by Luis Zendejas that gave Dallas a 10-9 lead.

Chicago threatened in the third as Greg Clark blocked a Mike Saxon punt to give the Bears the ball at the Dallas 31. Tomczak moved the Bears to the 5, but Calvin Thomas fumbled on a hit by linebacker Ron Burton and the Cowboys' Garth Jax recovered.

The Cowboys took a 7-0 lead when Walker, who had only 16 yards in the first period, slipped through the line on a draw and rambled 54 yards for a touchdown with 10:11 left in the first half.

Walker finished the night with 75 yards on seven carries.

The Bears' Lou Barns returned the ensuing kickoff 97 yards for a touchdown, but the score was called back on a penalty. Two plays later, starting quarterback Jim McMahon hit Thomas Sanders on an 86-yard toucdown pass with 8:58 remaining. Chicago trailed 7-6 after the snap on the extra point was low and Tomczak was tackled short of the goal line.

The Bears took the lead after a 56-yard Saxon punt to the Bears 10. McMahon engineered a 12-play drive that ended with Kevin Butler's 29-yard field goal with 13 seconds remaining in the half for a 9-7 lead.

Cowboys starting quaterback Steve Pelluer left the game with a concussion midway through the second quarter following a hit by Dante Jones. He hit only 2 of 9 passes for 20 yards. He was replaced by White, who hit 12 of 21 for 106 yards.

McMahon, who played the first half, completed 12 of 21 passes for 208 yards. Tomczak was 4 of 8 for 31 yards while Harbaugh completed 5 of 9 for 63 yards.