Paired on a forward line with fellow ex-Quebec wingers Jean-Guy Gendron and Simon Nolet, he was an immediate star, leading the Flyers in scoring in both 1969 and 1970.

After the 1971 season, Lacroix was traded to the Chicago Black Hawks and was dismayed at the change of scenery, playing poorly the next year.

[3] The New York-New Jersey team moved yet again for the 1975 to California to become the San Diego Mariners, and Lacroix continued his success.

As of 2024, only Orr, Lacroix, Wayne Gretzky, Mario Lemieux, Nikita Kucherov and Connor McDavid have accumulated 100 assists in a season.

His skills diminishing at last, Lacroix played briefly and respectably for the Whalers after their move to the NHL in the 1980 season (with Gordie Howe and Bobby Hull) before retiring.

(Bill) Hunter Trophy: In 2010, he was elected as an inaugural inductee into the World Hockey Association Hall of Fame.