Lynch was traded to the Giants by the Washington Redskins following the 1958 season for a 1960 fourth-round draft choice. He played for the Giants from 1959-66, a period in which the team played in four NFL Championship Games. Lynch played in 97 regular season games for the Giants (109 in his career) and intercepted 35 passes. In both 1961 and 1963, he led the NFL with nine interceptions. In '63, he also led the league with 251 return yards and three touchdowns. Lynch scored seven career touchdowns, four on interception returns and three on fumble returns.
Although he had a great playing career, Lynch was best known to legions of Giants fans for his 40 years as the analyst on the team's radio broadcast. His last game in the booth was the Giants' epic Super Bowl XLII victory over New England. Lynch died nine months later.