After his college career ended, Warren Lahr signed with the Cleveland Browns as a backup Quarterback in 1948.  Injuries kept him from playing, but he was ready to suit up in 1949, where he would become a Safety and help the Browns win the last AAFC Title of the league's existence.

Lahr, who was almost cut at one point, would become a top defender for Paul Brown's squad, and he became a certifiable ball hawk who nabbed 44 Interceptions over his 11-year career, all with Cleveland.  He was an essential part of the Browns NFL Championships in 1950, 1954 and 1955, and went to the Pro Bowl in 1953.  Cleveland named Lahr as an honored Legend in 2008.