Associated Press reportssigned a one day contract worth a $1 million dollars to announce his retirment from the National Football League (NFL) on Thursday at the Miami Dolphins facility in Davie Florida. Zach was a fifth round draft from Texas Tech University in 1996. He was one of the faces of the Miami Dolphins along with quarterback and brother in law Jason Taylor. Zach career totals include 1,038 tackles, 19.5 quarterback sacks, 17 interceptions in 168 games with the Miami Dolphins. He left the Dolphins in 2008 to play for the Dallas Cowboys, then was in training camp in 2009 with the Kansas City Chiefs before he was released before the regular season due to injuries that never revealed. Zach admitted being nervous at the retirement ceremony that he celebrated with his wife Maritza, his 4.5 month old son, agents Drew and Jason Rosenhaus, family and close friends. Zach has asked upon his death to donate his brain to the Center For The Study Of Traumatic Encephalopathy at Boston Medical Of Medicine. Zach suffered numerous concussions throughout his football career that he admits is too numerous to mention. On Thursday he felt fine. Dan Marino said "I think it's great that Zach is retiring as a Miami Dolphin. As a player who spent my entire career with the Dolphins, I can appreciate what it means to Zach to finish his career as part of the team that meant so much to him during his playing days."