Johnson graduated from Sam Houston High School in San Antonio, Texas in 1962. He attended Texas A&I (now Texas A&M–Kingsville).[1]
He entered the 1966 NFL Draft, and became the first Texas A&I player to be drafted in the first round. Over his professional career, he threw 647 of 1,286 passes (a 50.3-percentage) for 51 touchdowns and 90 interceptions.[1]
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