By Madison Williams The 24-year-old received a $30 million signing bonus, the largest ever for a receiver. View the original article to see embedded media. Seahawks star wide receiver DK Metcalf is expected to sign a three-year, $72 million extension with Seattle, per ESPN’s Adam Schefter. The 24-year-old is guaranteed $58.2 million, the eighth-highest total among wideouts. He also reportedly will receive a $30 million signing bonus, which is the most for a wide receiver in NFL history. The deal comes after extensive talks between team and player regarding an extension. He previously shut down…