The Boston Bruins have lost a few of their key depth players so far this offseason, with Riley Nash, Tim Schaller and Anton Khudobin all moving on to different teams, but not everyone is getting away.

Center Sean Kuraly signed a three-year, $1.275 million contract extension Tuesday, locking up the center through the 2020-21 season.

Kuraly, 25, was arbitration eligible this season after his first full season. He was a regular contributor as a fourth-line center, scoring six goals and adding eight assists in 75 games.

At 6-foot-2, 213 pounds, Kuraly was effective at using his size to win picks along the boards in the offensive zone. He brings a reliable two-way game to the Bruins’ depth forwards, and could have a shot at taking on the third-line center role now that Nash has moved on.

The Bruins also signed a one-year, two-way contract with forward Anton Blidh. The 2013 sixth-round pick had 11 goals and 15 assists with the Providence Bruins last season.

COYOTES: Arizona signed center Brad Richardson to a two-year, $2.5 million contract.

The 33-year-old Richardson has played three seasons in Arizona, with 19 goals and 36 assists. He had three goals and 12 assists in 76 games last season after being limited to 16 games due to injuries in 2016-17.

Richardson has 81 goals and 123 assists in 13 NHL seasons with Arizona, Vancouver, the Los Angeles Kings and Colorado Avalanche.

TRADE: Toronto dealt the feisty forward Matt Martin to the Islanders, who drafted him in 2008, for minor-league goalie Eamon McAdam.

Martin signed a four-year, $10 million deal with the Leafs prior to the 2016 season. After playing every game in his first season with the Leafs, Martin suited up for just 50 games this past season and did not dress for Toronto’s seven-game playoff series against Boston.

In 132 games for the Leafs, the 29-year-old Martin had eight goals, 13 assists and 173 penalty minutes.

The 23-year-old McAdam split the 2017-18 season between Bridgeport of the AHL and Worcester of the ECHL. A third-round pick of the Islanders in 2013, McAdam has not played in the NHL.

• Also on Tuesday, the Islanders agreed to a one-year, $1.5 million deal with goalie Robin Lehner. Lehner had a 3.01 goals-against average with a .908 save percentage in 53 games with the Buffalo Sabres last season.

The Sabres declined to give Lehner a $4 million qualifying offer as a restricted free agent and relinquished his rights. He will try to improve the Islanders goaltending which allowed a league-high 293 goals last season.

STARS: Left wing Remi Elie signed a one-year, $735,000 contract to stay with Dallas.

Elie had six goals and eight assists in 72 games last season for the Stars. He added two goals and seven assists in 19 AHL playoff games with the Texas Stars.

Dallas selected the 23-year-old Elie in the second round, 40th overall, in the 2013 NHL draft.

PREDATORS: Nashville signed forward Colin Blackwell to a two-year, two-way contract. Blackwell will make $650,000 at the NHL level and $100,000 at the AHL in 2018-19.

The 25-year-old Blackwell had 17 goals and 28 assists in 61 games with the AHL’s Rochester Americans in 2017-18.