The Buffalo Bills have placed starting Lee Evans (ankle) on injured reserve, ending the wide receiver’s season. As first reported by FOXSports.com, the Bills also placed second-year TE Shawn Nelson (migraines) on the reserve/non-football illness list.

To take their place on the 53-man roster, the Bills signed OTs Erik Pears and Colin Brown.

Brown (6 feet 7, 335 pounds) joins Buffalo from the Baltimore Ravens practice squad. The former University of Missouri standout entered the NFL as a fifth-round (139th overall) draft choice of Kansas City in 2009 and spent his rookie year on injured reserve. He joined the Ravens’ practice squad after being waived by the Chiefs prior to the 2010 regular season.

Pears, a six-year NFL veteran, joins Buffalo after being waived by Jacksonville on Nov. 9. The 6-8, 305-pound Colorado State University player entered the NFL as an undrafted free agent with Denver in 2005. He has started 30 of 44 games played with stints with the Broncos (2005-08) and Oakland (2009).

Buffalo also signed WR Bobby Williams to its practice squad. Williams was released from Houston’s practice squad on Oct. 5. The 6-4, 215-pound University of North Alabama player entered the NFL as an undrafted free agent with the Minnesota Vikings in 2009 and was released before the regular season. The Bills released OL Marc Dile from the practice squad to make room for Williams.

A source confirmed Williams and Pears worked out for the Bills on Tuesday.

-- Adam Caplan