during Game Six of the MLB World Series at Busch Stadium on October 27, 2011 in St Louis, Missouri.

A baseball great is fighting for his life after another devastating health setback

He was one of the greatest.

Lou Brock, a baseball Hall of Famer for the St. Louis Cardinals who was one of the greatest base stealers ever, is being treated for blood cancer, the team announced Tuesday.

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Brock, 77, is being treates for multiple myeloma, a cancer that starts in the bone marrow's plasma cells. Brock has also suffered from the effects of Type 2 diabetes. He suffered an infection due to diabetes complications and in 2015 had his leg amputated below the knee. He wears a prosthesis.

Brock was elected to the Hall of Fame in 1985 following a stellar, 19-year career with the Cardinals. He amassed 3,023 hits (25th all-time), along with 938 stolen bases, which is still a National League record. A career .293 hitter, he's a two-time World Series champion who stole 50 or more bases for 12-straight seasons.