After not showing up to the Denver Broncos practice facility on Tuesday, offensive lineman John Moffitt followed it up by announcing his retirement on Twitter:

Football was fun but my head hurts-haha kidding roger goodell. I'm on to new things, thanks to everyone along the way!!! — John Moffitt (@Moffitt74) November 5, 2013

The tweet came less than an hour after the Broncos officially announced that they had activated center J.D. Walton to the 53-man roster and placed Moffitt on the reserve/left squad. At age 27, Moffitt says he is ready to hang up his cleats.

A third round draft pick by the Seattle Seahawks in 2011, Moffitt started in nine games as a rookie, allowing five sacks. Moffitt started in six games in 2012 before being traded to Denver prior to the 2013 season.

Moffitt was inactive for six of Denver's eight games this season, seeing no playing time on offense. Once Moffitt's retirement becomes official, Walton will replace him on the 53-man roster (Denver has five days to officially make a corresponding roster move to Walton's activation because they placed Moffitt on the reserve/left squad earlier today).

Moffitt said on the radio on Tuesday afternoon that though many have tried to talk him out of it, his decision has been building for some time.

John Moffitt, on @ESPNLockerRoom, says he "kind of lost his passion" for football, & that his decision has been building "for a while." — Andrew Mason (@MaseDenver) November 5, 2013

As for what comes next, Moffitt mentioned radio, "but not sports radio."

We wish Moffitt nothing but success in his post-football endeavors.