The Patriots officially placed veteran offensive lineman Matt Light on the reserve/retired list today, according to a source.
This means that Light's retirement, from a paperwork standpoint, is official. By placing him on the reserve/retired list, Light doesn't count against the Patriots' 90-man roster limit.
This move has been anticipated for more than a month. Light played his entire career with the Patriots after the team selected him in the second round of the 2001 draft, serving as Tom Brady's blindside protector.
With the NFL announcing that rosters would expand to 90 effective today, and with unsigned draft picks counting against that limit, placing Light on the reserve/retired list opens up another spot and creates additional salary cap space.
It's possible that Light could change his mind (e.g. Randy Moss), but with today's transaction, Light is now considered retired.