PHILADELPHIA — Former major leaguer John Marzano died today after falling down a flight of stairs at his home. He was 45.

The cause of his death was not immediately clear, police said.

Marzano was from Philadelphia and had been working for Major League Baseball's Web site, where he co-hosted a show on weekday mornings.

"John was a beloved member of our team, a personable, terrific friend to all with whom he worked," said Bob Bowman, chief executive officer of MLB Advanced Media. "He was an engaging, informed interviewer. His energy, knowledge of the game and comedic touch produced admirable results. We miss him dearly already."

In a statement announcing his death, MLB said Marzano had fallen. MLB.com will establish an internship program in Marzano's name, the release said.

Before joining MLB's Web site, Marzano was a baseball analyst on Comcast SportsNet for the station's Philadelphia Phillies' postgame shows. He had also appeared regularly on WIP-AM.

"The Phillies family is saddened by the news of John Marzano's untimely death," Phillies president David Montgomery said in a statement. "John was an endeared member of the Philadelphia sports community who not only represented our city well as both an athlete and a broadcaster, but also had incredible passion for the games we play. Our deepest condolences go out to the Marzano family at this difficult time."

A graduate of Temple, Marzano earned a spot as a catcher on the 1984 U.S. Olympic team that included future major league stars Mark McGwire, Barry Larkin and Will Clark. He was drafted by the Boston Red Sox with the 14th overall pick in the first round of the 1984 amateur draft.

Marzano played 10 seasons in the big leagues for the Boston Red Sox, Texas Rangers and Seattle Mariners before retiring in 1998. He also played in the minors for the Phillies and the Cleveland Indians.

Overall, Marzano batted .241 with 11 homers and 72 RBIs in 794 at-bats in 301 games.

Marzano was popular in Seattle for his altercation with New York Yankees outfielder Paul O'Neill during a game in 1996. The two traded punches at home plate after O'Neill took exception to a knockdown pitch by Tim Davis.

Marzano is survived by his wife, Terri, daughters Dominique and Danielle, and two grandchildren.