Defenseman Alex Pietrangelo, seen as the top free-agent prize in the NHL this offseason, agreed Monday to a seven-year deal worth $8.8 million a year with the Vegas Golden Knights, a source confirmed to ESPN.

The deal, worth a total of $61.6 million and including a no-movement clause, was first reported by The Athletic.

Pietrangelo was drafted fourth overall by the St. Louis Blues in 2008. They are the only NHL team for which he has played, serving as their captain since 2016 and helping the team to its first Stanley Cup in 2019.

Pietrangelo's time with the Blues was effectively over after they signed free agent defenseman Torey Krug of the Boston Bruins to a seven-year, $45.5 million contract Friday.

"We had some really good conversations and we just couldn't get anything done," said Blues GM Doug Armstrong, who said the team offered Pietrangelo a maximum-length, eight-year contract extension. "There's no good or bad person in this. It's just the business side of it."

The Blues previously offered Pietrangelo an average annual salary of $8 million at varying lengths of a deal, including an eight-year contract. But Pietrangelo reportedly wanted a no-movement clause and signing bonus built into the latter years of the contract in case his deal was bought out.

The 30-year-old had 16 goals and 36 assists in 70 games during the 2019-20 regular season and one goal and five assists in nine postseason games as the Blues were eliminated in the Western Conference quarterfinals by the Vancouver Canucks.

Information from ESPN's Greg Wyshynski was used in this report.