Dave Barnett still being evaluated

ARLINGTON, Texas -- Texas Rangers television play-by-play announcer Dave Barnett will not work this weekend's series against the Colorado Rockies as he continues to be evaluated after having an on-air issue Monday night.

"We don't have all the results back, and he continues to be evaluated," Rangers vice president of communications John Blake said. "Until we know what caused the issue Monday night and what the resolution is, he will not work Rangers games."

Barnett, 54, missed the final two games of the San Diego series so he could have tests done. He has not completed those tests.

In the eighth inning of Monday's game, with Rangers reliever Mike Adams on the mound, Barnett's description of the game took a strange turn.

"A 2-1 game, the tying run at second on a leadoff single by Chase Headley," Barnett said on the telecast. "The go-ahead run ... is at fifth, on what Adams is insisting on calling a botched robbery. What actually happened was his henchman took a piece literally out of ..."

Barnett, who blamed a recurrence of migraine headaches for the unusual behavior, took over as the Rangers' lead television voice during the 2011 season after two seasons in the radio booth.

With Barnett out, the Rangers will continue to pair radio announcer Steve Busby in the TV booth with analyst Tom Grieve.

Bryan Dolgin, who handles pregame and postgame duties on the radio, takes Busby's spot.