The 5-foot-11, 206-pound Demps was originally drafted by Philadelphia in the fourth round in 2008. He was waived in September 2010, signed with Houston two months later and then was cut at the end of training camp this year.
The 5-5, 170-pound Holliday was drafted by the Texans in the sixth round of the 2010 draft. He was on the practice squad when this season began and was called up on Oct. 5, after Andre Johnson was injured.
Copyright 2011 by The Associated Press