Reds outfielder Dernell Stenson was found dead Wednesday on a residential street after he was shot and apparently run over in a Phoenix suburb, police said.
Chandler police said the death was being treated as a homicide.
A man was being held by police for questioning. No charges had been filed as of early evening.
Stenson, 25, made his major-league debut this season and played 37 games for the Reds. He hit .247 with three home runs and 13 RBIs.
"We extend our prayers and deepest sympathies to Dernell's family and his friends, teammates and coaches," Reds spokesman Rob Butcher said.
Stenson was in the Phoenix area playing for the Scottsdale Scorpions of the Arizona Fall League, a developmental league for top prospects.
Stenson's body was found after police received a call around 1:45 a.m. that shots had been fired. Witnesses told police a black SUV was seen leaving the area.
METS ADD PETERSON: New York hired Rick Peterson as pitching coach, reuniting him with manager Art Howe in an attempt to turn around a staff that struggled last season.
In their first news conference since making Jim Duquette general manager last week, the Mets also said they want to re-sign the team captain, left-hander John Franco, 43.
PLAYERS CHOICE AWARDS: Cardinals leftfielder Albert Pujols was voted player of the year by his peers in balloting conducted by the Major League Baseball Players Association.
Pujols also won NL outstanding player. Rangers shortstop Alex Rodriguez was voted AL outstanding player for the third straight season.
Toronto's Roy Halladay was voted the AL's outstanding pitcher, and Los Angeles reliever Eric Gagne won in the NL. Kansas City's Angel Berroa and Milwaukee's Scott Podsednik were voted outstanding rookies.
CASTRO TO STAND TRIAL: Marlins backup catcher Ramon Castro was ordered to stand trial on charges that he raped a woman in a Pittsburgh hotel this summer. She testified that he attacked her.
GOLD GLOVES: Atlanta pitcher Mike Hampton ended Greg Maddux's record run at 13 NL Gold Gloves, and Luis Castillo and Derrek Lee of the World Series champion Marlins won for the first time. Scott Rolen, Edgar Renteria, Jim Edmonds and Mike Matheny of the Cardinals also were honored. Complete list, 9C.
RED SOX: Terry Francona interviewed for the managerial job, saying he has changed since he managed the Phillies to four losing seasons. "I was very young. I was learning kind of on the run," he said. "I had a goal back then to be a major-league manager. Now I have a goal to be a successful major-league manager. I think it can be done."
WHITE SOX: Dave Wilder was hired as a special assistant to general manager Kenny Williams. Wilder was a special assignment scout last season for the Brewers after serving as vice president of player personnel from 2000-02.