Karl Kenneth Singer (born October 12, 1943) is an American former professional football player who was a tackle for three seasons with the Boston Patriots of the American Football League (AFL). He was selected by the Patriots in the first round of the 1966 AFL draft. He was also chosen by the Cleveland Browns in the 19th round of the 1966 NFL draft. He played college football for the Purdue Boilermakers and attended Niles McKinley High School in Niles, Ohio.
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