Marner signed an eight-year contract extension worth an average annual value of $12 million

The Toronto Maple Leafs made their trade of Mitch Marner official on Tuesday morning.

Mitch Marner is going to Vegas, after the Golden Knights made another major move to add a big-time player, snatching up the top pending free agent before the rest of the NHL got the opportunity. They got Marner in a sign-and-trade with the Toronto Maple Leafs agreed to on Monday and announced early Tuesday.