Former Baltimore Ravens wide receiver Mark Clayton is retiring from the NFL.

The 30-year-old Clayton announced his decision on Facebook Wednesday, attributing it, among other things, to finally being healthy again and wanting to "keep it that way."

Clayton was the Ravens' first-round pick in the 2005 NFL draft. He spent five years with Baltimore before being traded the St. Louis Rams in 2010.

He looked to be on the verge of a breakthrough season during that first year with the Rams - and had 23 catches for 306 yards and two touchdowns in St. Louis' first four-plus games - but he suffered a season-ending knee injury during St. Louis' fifth game of the season.

The surgery to repair the injury was the first of three major knee procedures Clayton has undergone during the last two-plus years.

He last played in an NFL game Nov. 20, 2011. He finishes his career with 260 catches for 3,448 yards and 14 touchdowns, with 234 of those catches, 3,116 of the yards and 12 of the touchdowns coming during his five seasons in Baltimore.