He was traded on June 12, 1940 to the St. Louis Cardinals with Bert Haas, Sam Nahem and Carl Doyle and $125,000 for Curt "Coonskin" Davis and Joe "Ducky" Medwick. He played 91 games as an outfielder with the Cardinals in 1940, and 12 games of the 1941 season with the Cardinals. He was traded from the Cardinals to the Cincinnati Reds on May 14, 1941. He played 49 games of the remaining 1941 season in a Reds uniform. He was sold by the Reds to the Philadelphia Phillies on May 2, 1942. He appeared in 78 games with the Phillies, and was eventually released from his contract May 27, 1946 after serving in the Navy during World War II. He ended his career with a .279 batting average, 36 home runs, 260 runs batted in, 238 runs, 515 hits and 40 stolen bases in 558 games. In 1960, he was inducted into the University of Texas Longhorn Hall of Fame. Koy died on January 1, 2007 at age 97 at his home in Bellville, Texas, one month after breaking his hip. He is buried at Oak Knoll Cemetery in Bellville.
29° 56.744, -096° 14.997
Oak Knoll Cemetery