A product of the NCAA’s University of Maine, Keeper signed with the Florida Panthers toward the end of the 2018-19 season as a collegiate free agent. He debuted with the Panthers during the 2018-2019 season, skating for 12:40 in a game against the Ottawa Senators on March 28, 2019. He recorded one blocked shot and two hits.
He spent the next few years moving from the Panthers to the Vancouver Canucks, before finally landing in the Montreal Canadiens organization in the 2023-24 season. Outside of an additional game with Florida, he’s only played in the AHL, finishing his career with 10 goals and 31 points in 129 games with a -2 rating and 208 PIMs. Unless he changes his mind on retirement in the next few years, his last professional hockey contest will have come with the AHL’s Laval Rocket in 2024.