Did not say what did him in but Brock lost a leg from diabetes in recent years and was diagnosed with cancer in 2017. RIP Lou, I enjoyed watchin you!
https://www.espn.com/mlb/story/_/id...ou-brock-cardinals-base-stealing-icon-dies-81
https://www.espn.com/mlb/story/_/id...ou-brock-cardinals-base-stealing-icon-dies-81