The Chicago Blackhawks and Brent Seabrook agreed to an eight-year contract extension on Saturday.

The deal is worth $55 million total, with a $6.875 million average salary that takes effect a year from now, sources told ESPN.com's Pierre LeBrun.

Seabrook was set to become an unrestricted free agent after the season. His last contract was for five years and $29 million. 

The Toronto Maple Leafs announced Sunday that the club has agreed to terms with free agent forward Brad Boyes on a one-year contract.

Boyes was originally invited to training camp with Toronto on a professional try-out.

Boyes, 33, appeared in 78 regular season games last season with the Florida Panthers, collecting 38 points (14 goals, 24 assists) and 20 penalty minutes. The Mississauga, Ontario native has registered 481 points (203 goals, 278 assists) in 762 career NHL games with the San Jose Sharks, Boston Bruins, St. Louis Blues, Buffalo Sabres, New York Islanders and Florida. 

George McPhee has been named special adviser to general manager Garth Snow.

Snow announced the appointment of the former Washington Capitals general manager Wednesday.

McPhee served as the Capitals' general manager for 17 seasons beginning in 1997-98.

Bruins defenseman Dennis Seidenberg will have surgery Thursday to repair a lumbar spine disk herniation and will be sidelined approximately eight weeks, the team announced Wednesday.

Dr. Louis Jenis will perform the lumbar microdiscectomy at Massachusetts General Hospital.

Seidenberg suffered the injury during an offseason workout. 

The Avalanche have locked up Erik Johnson through the 2022-23 season, signing the defenseman to a seven-year contract extension Tuesday.

The deal carries a $6 million average annual value, a source told ESPN.com's Pierre LeBrun.

Johnson scored a career-high 12 goals last season before missing the final 34 games with a knee injury. 

John Tortorella, the most successful American coach in NHL history, has been named to lead the United States' entry in the 2016 World Cup of Hockey.

Tortorella, whose 446 NHL victories are 10 more than that of Predators coach Peter Laviolette, last coached in the NHL with the Canucks during the 2013-14 season and has since acted periodically as a studio analyst for ESPN.

The Ducks have signed goalie John Gibson to a three-year contract extension, the club announced Monday.

The deal is worth an average of $2.3 million per season, a source told ESPN.com. It breaks down as $1.5 million in the first year, $2.1 million in the second season and $3.3 million in the final season.

The Oilers announced a seven-year contract extension for 20-year-old defenseman Oscar Klefbom on Sunday.

According to an NHL source, the contract is worth $4.167 million per season.

Tests from a rape kit show no evidence of DNA from Blackhawks star Patrick Kane in the accuser's genital area or her undergarments, The Buffalo News reported Saturday, citing sources.

Patrick Kane was prepared for anything Friday as he stepped onto the ice in front of Blackhawks fans for the first time since he came under investigation for an alleged sexual assault. 

A majority of the crowd, an estimated 4,000 people, showed its support with loud cheers as Kane began skating with teammates before a scrimmage at Notre Dame's Compton Family Ice Arena.