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Columbus, Toronto and Detroit invested a lot one year ago in some of the top free agents — Nathan Horton, David Clarkson and Stephen Weiss, respectively — and each team probably wishes it had spent that money on other players.

“There’s a lot of things that happen on free agency day that some teams look back and wonder why they did it,” Sharks general manager Doug Wilson said. “There will be a time and place for us to be active in the free agent market, but it’s certainly not now while we’ve committed to our younger players, and that’s what we’re going to do.”

The Avalanche had quite a turnaround last year with 18-year-old Nathan MacKinnon, the Calder Trophy winner as top rookie. On a day they lost a key player in Stastny, they picked up an aging player who has proven he’s still got it.

Jarome Iginla signed a three-year, $16 million deal on Tuesday, his 37th birthday, with Colorado after the wing had 30 goals to tie for the most in Boston last season. The Avs also acquired a veteran defenseman, Brad Stuart from San Jose, for a second-round pick in two years and a sixth-round selection in 2017.

The Tampa Bay Lightning also were active, landing veteran defensemen Anton Stralman and forward Brian Boyle to give the team more grit after it was swept in the first round of the playoffs. Both helped the Rangers make the Stanley Cup finals, as did center Brad Richards, who signed with Chicago.

New York added veteran defensemen Dan Boyle, Matt Hunwick and Mike Kostka.

Tampa Bay also added goaltender Evgeni Nabokov after not having a backup capable of playing well when Ben Bishop was hurt in April.

Mike Cammalleri signed a five-year, $25 million contract with the New Jersey Devils, giving them a desperately needed offensive boost.

Six-plus hours into free agency, some notable players were still available: Dany Heatley, Mike Ribeiro, Daniel Alfredsson and Martin Brodeur, the NHL’s all-time winningest goalie.

The Detroit Red Wings, who signed restricted free agent forward Riley Sheahan to a $1.9 million, two-year contract, await the 41-year-old Alfredsson’s decision whether to retire.

“If his back feels good in August, we’ll talk about a one-year deal with him,” general manager Ken Holland said. “He’s not going to sign a deal with anyone else.”