The 1964 World Series was the high-water mark of Warwick's baseball career. He batted only .132 in a season split between the Cardinals and Orioles, and then .227 in 16 games for the last-place Cubs. His contract was purchased by the Orioles from the Cardinals on July 24, 1965. He appeared in nine games but was hitless in fourteen at bats. He made it on base only on three walks but scored each time. He was traded from the Orioles to the Cubs for Vic Roznovsky on March 31, 1966. He retired from baseball prior to the 1967 season, returning to Houston and operating real estate and travel agencies.