Kimberley A. Martin of Newsday was the first to report details of the deal before Marshall tweeted a photo of his signed contract:
Marshall requested his release from the New York Jets in early March, per Martin, amid widespread changes to the roster, including the exit of several notable names. Nick Mangold, Darrelle Revis, Ryan Fitzpatrick and Nick Folk were among those who left the organization.
The New York front office obliged. Eric Allen of the Jets' official website passed along comments from team owner Woody Johnson, who praised the playmaker on his way out.
"Brandon's commitment and passion for football is undeniable," Johnson said. "His drive to support mental health awareness is beyond admirable. We appreciate his contributions to the organization and wish him the best."
"I'm sorry we couldn't bring you a championship, but I wish you and my former organization the very best in your pursuit for one in the future," he wrote of Jets fans. "I'm looking forward to finding a great organization where I can contribute and bring home a championship. I know I have a lot left to give, and [wife Michi Marshall] and I will truly miss the Jets, but we are excited for what lies ahead."
Marshall enjoyed an outstanding first season with the Jets in 2015. He racked up 109 catches for 1,502 yards and 14 touchdowns, earning his sixth trip to the Pro Bowl.
His numbers faded in 2016 as the offense as a whole dropped to 26th in the league. He finished with just 59 grabs for 788 yards and three scores in 15 games.
In all, the 12th-year UCF product has tallied 941 catches for 12,061 yards and 82 TDs in 167 games since the Denver Broncos took him in the fourth round of the 2006 draft.
It's unclear whether he's still capable of producing high-end numbers at this stage of his career. Even though he didn't look nearly as dynamic with the Jets last season, some of those struggles can be contributed to the offense as a whole. Signing him is a worthwhile risk for the Giants.
As Marshall joins his new team, look for him to slot in as a starter opposite Odell Beckham Jr. Along with getting to stay in New York, playing alongside one of the game's most dangerous weapons should put him in position to enjoy a strong bounce-back campaign in 2017.