PHOENIX — The Arizona Diamondbacks fired manager A.J. Hinch and general manager Josh Byrnes Thursday night.

Arizona was 31-48 and in last place in the NL West, 15½ games back of San Diego entering Thursday's games.

Hinch is the fourth manager to lose his job this season. Florida's Fredi Gonzalez, Baltimore's Dave Trembley and Kansas City's Trey Hillman have also been fired.

The NFL has suspended free agent running back LenDale White for four games for violating the league's substance-abuse policy and free agent defensive tackle Hollis Thomas for eight games for violating its performance-enhancing substances policy.League spokesman Randall Liu confirmed the suspensions Thursday in an e-mail to The Associated Press.