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Sandy Alomar Sr. -- the father of ex-MLB stars Roberto Alomar and Sandy Alomar Jr. -- has passed away at 81 years old.

The league confirmed the news on Monday ... after a local outlet in Puerto Rico reported the former California Angels star suffered a medical incident just a week prior to his 82nd birthday.

Alomar Sr. spent 15 years playing in the big leagues ... suiting up for six different teams. He finished his career with a .245 average, 13 home runs and 282 RBIs. While he didn't have much pop, Alomar Sr. was a threat on the basepath, stealing 227 bases during his career.

However, his baseball life didn't end there ... he spent time as a coach for the San Diego Padres, Chicago Cubs, Colorado Rockies and the New York Mets after retiring from playing. Getty

His two so

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