In September 1941, Karwales" debut was again delayed due to swelling in his feet that led doctors to "relegate him to a hospital cot for treatment." He played for the 1941 Michigan team that finished 6-1-1 and ranked Number. 5 in the final Associated Press poll, and for the 1942 Michigan team that finished 7-3 and ranked Number.
He played at the end and tackle positions for the in 1941 and 1942. Following four years of service in the United States Army Air Forces during and after, he played professional football for the Chicago Bears in 1946 and for the Chicago Cardinals in 1947. In 1939, Karwales enrolled at the He played football at the end position (some at the tackle position in 1942) for Fritz Crisler"s Michigan Wolverines football team from 1941 to 1942.
Karwales had been expected to play for the 1940 team, but a knee injury sidelined him for the season.
9 in the final Associated Press poll. In 1943, Karwales entered the United States Army Air Forces where he served for almost four years during an after He served in the Pacific theater, and also played football with the Third Air Force team in 1944.
In June 1946, Karwales was signed by George Halas to play for the Chicago Bears. He joined the Bears in August 1946 for their summer training camp in Collegeville, Indiana.
Other sources do not list Karwales among the regular season roster of the 1946 Bears.
A Chicago Daily Tribune article from September 1947 reported that Karwales had played with the Akron Bears in 1946. Karwales participated in training camp and pre-season for the Bears in the summer of 1947. He was released by the Bears on September 22, 1947, prior to the first game of the regular season.
Karwales signed with the Chicago Cardinals on October 1, 1947.
He played for the 1947 Cardinals team that compiled a 9-3-0 record and finished 1st in NFL West Division. Karwales was hampered as a football player by bad knees and retired as a football player in 1948.
He coached football at Saint Louis University football for three years. He was an assistant coach for the Saint Louis Billikens under head coach Joe Maniaci.
Karwales was married to Virginia Kailer.
They had two daughters, Cathy O"Hara and Jill Fink. Felix was injured in action in Germany in February 1945 and died in October 1949. Karwales became a co-owner of the Kailer-Youngquist Oldsmobile dealership in Chicago.
The dealership was started by his father-in-law, Louis G. Kailer, who died on January 12, 1956.
He later owned an Oldsmobile dealership named Karwales Olds, incorporated located in Wheaton, Illinois. Karwales was a resident of Evanston, Illinois for approximately 50 years. Karwales died on December 31, 2004 at the Bethany Retirement Community in Chicago.