Drafted by the Montreal Canadiens sixth overall in the 1970 NHL Amateur Draft, Lefley started his National Hockey League career with Montreal in 1971. He was traded from the Canadiens to the St. Louis Blues for Don Awrey on November 28, 1974.
Lefley, drafted by the Montreal Canadiens as their sixth amateur draft pick in 1970 and beginning his National Hockey League career with them in 1971, was subsequently traded to the St. Louis Blues for Don Awrey on November 28, 1974.