In January 2014, then-Lightning general manager Steve Yzerman, who also served as the general manager for Canada's team at the 2014 Winter Olympics, elected not to include St. Louis on Canada's roster.
St. Louis was ultimately named to the team as an injury replacement after Steven Stamkos was not medically cleared to play.
At the same time, St. Louis requested a trade from Tampa Bay.
The no movement clause in his contract gave St. Louis control over where he could be moved and he reportedly consented to only being traded to the New York Rangers, a request he first made in 2009.
The Lightning honoured his request, and St. Louis was sent to New York along with a conditional 2015 second-round pick on March 5, 2014, in exchange for Ryan Callahan, a 2015 first-round draft pick, a conditional 2014 second-round pick (which became a first-round pick) and a conditional 2015 seventh-round pick.
Both of the first-round draft picks acquired by the Lightning in this trade were eventually traded to the New York Islanders.
Though reluctant to speak of his reasons for requesting the trade, he eventually admitted the initial Olympic snub was the primary cause.
He felt a lack of respect when Yzerman initially left him off the Canadian team.
 St. Louis also expressed his regret over the damage the events caused to his relationship with the fans in Tampa.

St. Louis struggled offensively in his first games with the Rangers as he went 14 games without scoring a goal.
He scored only one in 19 regular season games – finishing the season with 30 combined between Tampa Bay and New York – and added seven assists to finish with 69 points on the season.
The death of his mother, France, of a heart attack on May 8 left St. Louis' participation in Games 5 and 6 of New York's second-round playoff series against the Pittsburgh Penguins in doubt.
He chose to play after speaking with his father.
The Rangers players rallied around St. Louis as he became the team's focus.
He led the Rangers as they overcame a 3–1 series deficit against Pittsburgh to win the series in seven games en route to reaching the 2014 Stanley Cup Final.
St. Louis led the team with 8 goals in the playoffs and finished second with 15 points, but the Rangers lost the final to the Los Angeles Kings in five games.

St. Louis returned to the Rangers for what would be his last NHL season in 2014–15, and was named an alternate captain underneath newly appointed captain Ryan McDonagh.

St. Louis made his first return to Tampa Bay on November 26, and was welcomed with a video tribute and standing ovation from the fans prior to the start of the game, which Tampa won 5–4.
Two days later, St. Louis recorded a goal and an assist against the Philadelphia Flyers to reach 1,000 points in his career, becoming the sixth undrafted player in NHL history to do so.
St. Louis would face the Lightning again in the 2015 Eastern Conference Final, in a series Tampa Bay won in seven games.
St. Louis finished the 2015 playoff campaign with 1 goal and 6 assists in 19 playoff games.

The Rangers did not offer St. Louis a new contract during the off-season, despite his desire to return to the team.
St. Louis did not receive any offers from other teams after becoming a free agent, and on July 2, he formally announced his retirement from professional hockey.
In January 2014, then-Lightning general manager Steve Yzerman, who also served as the general manager for Canada's team at the 2014 Winter Olympics, elected not to include St. Louis on Canada's roster. St. Louis was ultimately named to the team as an injury replacement after Steven Stamkos was not medically cleared to play. At the same time, St. Louis requested a trade from Tampa Bay. The no movement clause in his contract gave St. Louis control over where he could be moved and he reportedly consented to only being traded to the New York Rangers, a request he first made in 2009. The Lightning honoured his request, and St. Louis was sent to New York along with a conditional 2015 second-round pick on March 5, 2014, in exchange for Ryan Callahan, a 2015 first-round draft pick, a conditional 2014 second-round pick (which became a first-round pick) and a conditional 2015 seventh-round pick. Both of the first-round draft picks acquired by the Lightning in this trade were eventually traded to the New York Islanders. Though reluctant to speak of his reasons for requesting the trade, he eventually admitted the initial Olympic snub was the primary cause. He felt a lack of respect when Yzerman initially left him off the Canadian team.  St. Louis also expressed his regret over the damage the events caused to his relationship with the fans in Tampa.
St. Louis struggled offensively in his first games with the Rangers as he went 14 games without scoring a goal. He scored only one in 19 regular season games – finishing the season with 30 combined between Tampa Bay and New York – and added seven assists to finish with 69 points on the season. The death of his mother, France, of a heart attack on May 8 left St. Louis' participation in Games 5 and 6 of New York's second-round playoff series against the Pittsburgh Penguins in doubt. He chose to play after speaking with his father. The Rangers players rallied around St. Louis as he became the team's focus. He led the Rangers as they overcame a 3–1 series deficit against Pittsburgh to win the series in seven games en route to reaching the 2014 Stanley Cup Final. St. Louis led the team with 8 goals in the playoffs and finished second with 15 points, but the Rangers lost the final to the Los Angeles Kings in five games.
St. Louis returned to the Rangers for what would be his last NHL season in 2014–15, and was named an alternate captain underneath newly appointed captain Ryan McDonagh.
St. Louis made his first return to Tampa Bay on November 26, and was welcomed with a video tribute and standing ovation from the fans prior to the start of the game, which Tampa won 5–4. Two days later, St. Louis recorded a goal and an assist against the Philadelphia Flyers to reach 1,000 points in his career, becoming the sixth undrafted player in NHL history to do so. St. Louis would face the Lightning again in the 2015 Eastern Conference Final, in a series Tampa Bay won in seven games. St. Louis finished the 2015 playoff campaign with 1 goal and 6 assists in 19 playoff games.
The Rangers did not offer St. Louis a new contract during the off-season, despite his desire to return to the team. St. Louis did not receive any offers from other teams after becoming a free agent, and on July 2, he formally announced his retirement from professional hockey.
Martin St. Louis