[3] On the turn of the year Walter was recalled from Providence and made his NHL debut with the Bruins against the Los Angeles Kings on January 12, 2006.

[7] On March 11, 2008, Walter finally scored his first NHL goal (and point) against Karri Ramo and the Tampa Bay Lightning.

[11][12] Ben was leading Lowell in scoring after 45 games before on January 22, 2010, he was recalled to New Jersey to make his Devils debut against the Montreal Canadiens.

[14] During the 2010–11 pre-season, following the Avalanche's training camp, Walter was reassigned to AHL affiliate, the Lake Erie Monsters, to start the year.

After the conclusion of the 2012–13 with the Heat, Walter was signed to his first contract abroad as a free agent, agreeing to a one-year deal with Örebro HK of the Swedish Hockey League on May 25, 2013.

[16] In the 2013–14 season, Walter struggled to transition to the Swedish league, posting just 2 goals in 35 games with Örebro before accepting a mid-season transfer to the Finnish Liiga with Jokerit on December 29, 2013.

At the conclusion of his contract, Walter opted for a new venture, signing a one-year deal with Japanese based club, Nippon Paper Cranes of the Asia League on August 6, 2016.