I know this was already reported, and I wasn't going to make a big deal because Marcus McNeill isn't on the San Diego Chargers anymore, but the truth is that as a former Pro Bowler that only played with the Chargers and is now retiring at the age of 28....this is Chargers news.
McNeill started 82 games over six NFL seasons, making the Pro Bowl in each of his first two years. He was lauded as one of the best young Left Tackles in the league, a great value as the 50th pick in the 2006 NFL Draft, until neck injuries caught up with him in 2008.
In 2010, McNeill held out for the first five weeks of the season in protest of not being offered a long-term contract by the San Diego front office. Upon ending his protest, McNeill was signed to a 6-year deal worth $48.9 million. Luckily for the team, there were built in provisions to protect them if Marcus' neck issues flared up again.
After missing the last 7 games of the Chargers' 2011 season, the team doctors had a look at McNeill's neck and decided that he was unfit to play football. This allowed A.J. Smith to void the Left Tackle's remaining contract years, making Marcus a free agent.
Unfortunately, it would appear that the busted up neck of McNeill can not be healed and Marcus has decided to retire. Based on what I've seen out of him on Twitter, on the radio and on TV, it would not surprise me if this isn't that last we hear of Big Mac.