A team spokesman said the Mets learned of the death from friends of Staub who were with him at the time.
Staub, who became a huge hit with baseball fans in two countries during an All-Star career that spanned 23 major league seasons, died Thursday, March 29, 2018, in Florida.
He reportedly died early in the morning Thursday at Good Samaritan Medical Center.
The Daily News reports he faced several health issued over the years, and died of multiple organ failure after being admitted to the hospital with pneumonia, dehydration and an infection.
Born and raised in New Orleans, Daniel Joseph Staub was called Rusty because of his bright red hair. The six-time All-Star is the only player ever to have 500 hits with four different teams. "He was nearly as well known for his philanthropic work as he was for his career as a baseball player, which spanned 23 seasons".
Staub, who would have turned 74 on Sunday, played 23 seasons in the major leagues for the Mets, Houston Colt.45's/Astros, Montreal Expos Detroit Tigers and Texas Rangers.
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His final season was 1985, one year before the Mets won the World Series. He finished 284 hits shy of 3,000. Eleven days earlier he had almost died from a heart attack during a flight home from Ireland.
Having played for both the Tom Seaver-Bud Harrelson Era Mets and the Dwight Gooden-Keith Hernandez Era Mets, he was inducted into the club's Hall of Fame in 1986.
Staub returned to the Expos for an encore performance in July 1979 after being traded from the Detroit Tigers and was greeted with a standing ovation from a crowd of 59,260 at Olympic Stadium throughout his first at-bat. While Staub had a phenomenal career that many felt was deserving of the Hall of Fame, it is evident that what he did off the field made just as big of an impact as his 2,716 career hits.
Staub, who split time between first base and right field, was traded to the Mets in 1972 as part of a blockbuster deal that included fellow utility player Mike Jorgensen, shortstop Tim Foli and outfielder Ken Singleton. Staub announced in January that in conjunction with Catholic Charities his foundation had served more than 9 million meals to the hungry and homeless over the last 10 years.
He is survived by brother Chuck and sisters Sue Tully and Sally Johnson.