"We're very pleased to add Pat to our organization today," said Lightning general manager Julien BriseBois. "He brings size (6-foot-3, 225 lbs) and physicality to our group as well as significant playoff experience. We expect Pat to be a great addition to the roster."
Maroon signed a one-year deal with his hometown St. Louis Blues ahead of the 2018-19 season, and he played an important role while helping the club capture its first-ever Stanley Cup.
The 31-year-old recorded 10 goals and 28 points over 74 regular-season contests while also leading the team in hits with 135. He then added three goals - including the game-winner in double overtime of Game 7 against the Dallas Stars in the second round - and seven points in 26 playoff games.