He was a key member of Philadelphia's defense for several years, and along with Bill Bergey and John Bunting, led one of the best 1970s linebacking corps in the league.
Despite seeing major action only in his last two seasons, he compiled 40 touchdowns, 3,000 yards, and helped the team reach the Class AA state finals.
[3] Through the first five games of the 1972 season, LeMaster, remaining an inside linebacker, was the leading tackler on the team.
[3] However, after a loss to North Carolina, he was benched, with the coaching staff blaming him for poor defense.
He was also invited through the efforts of Kentucky assistant Buckshot Underwood to several all-star games, including the Blue–Gray Football Classic, at which he served as a team captain.
[1] As a rookie, he started all four preseason games and ended up making the team as the second-string left linebacker, behind Steve Zabel.
[9] As of March 2023[update], LeMaster is fourth all-time in team history for starts by a linebacker, trailing only William Thomas (129), Chuck Bednarik (122), and Bunting (116).
[9] When he retired, he placed sixth all-time for most consecutive games with Philadelphia and he also led the team in tackles four out of the nine seasons he played with them.
"[5] In 1980, he helped the team win the NFC Championship and reach Super Bowl XV, where they lost to the Oakland Raiders.
[5] He was traded to the San Francisco 49ers in 1984, and despite being told he had made the team, ended up being the final roster cut.