Terrors on Horseback (1946)

"OUTLAW GUNS BACK THE ROULETTE WHEEL... when Buster bets his life on a crooked spin!"

Fuzzy's niece is killed in a stagecoach hold-up. Billy and Fuzzy quickly learn that the culprit, who not only killed all the passengers but also absconded with $40,000, may be holed up in lawless Pecos City.