In his NHL career, Keenan appeared in 234 games. He scored 38 goals and added 64 assists. He is 12th in the Blues all-time playoff scoring with 15 goals in 46 playoff games. He was called up for a pair of games with the
Toronto Maple Leafs in 1961-62 before spending six years in the
AHL and WHL. When the league expansion in 1967 made journeymen a desirable commodity, Keenan found himself back in the NHL with the St. Louis Blues. He formed a hard-working forward line with
Terry Crisp and
Jim Roberts. Keenan scored the first-ever goal in
St. Louis Blues history on October 11, 1967, against
Cesare Maniago of the
Minnesota North Stars. He scored in the first Blues
home playoff game. As of 2026, Keenan is one of just four players in the expansion era to score a goal in the first home game of an expansion team in the regular season and the playoffs. Keenan was also on the ice for Bobby Orr's famous
1970 Stanley Cup Finals clinching goal—a scoring play that began when Orr pinched at the blue line and blocked Keenan's attempt to clear the zone with a pass to
Red Berenson. Keenan was traded to the Buffalo Sabres on November 4, 1970, along with
Jean-Guy Talbot for
Bobby Baun. His career ended prematurely due to injuries. ==Life after NHL==