An MRI done Saturday revealed the tear that Beauchemin sustained in a 4-3 overtime loss to Nashville on Friday. He will be placed on long-term injured reserve.
Beauchemin had four goals and one assist in 18 games this season. He was tied for the second-most playing time on the team.
"This is an unfortunate injury for Francois and we feel badly for him," general manager Bob Murray said. "However, knowing his character as a player and person, we know he will rebound from this and return to the ice at full strength."