The 25-year-old joins the Broncos after he was waived by Chicago on June 16. He spent the final five weeks of the 2005 season on the Bears' practice squad and also was on the active rosters of Miami and the New York Jets last season. He began 2005 on the Giants' practice squad before signing with the Jets.
As a rookie with the Giants in 2004, he spent the first five weeks of the season on New York's practice squad before finishing the year on its active roster.
In four years at Nebraska, Hollowell posted 173 tackles (76 solo), 3.5 sacks, two interceptions, one fumble recovery and one forced fumble. He started all 12 games in 2003 as an honorable mention All-Big 12 Conference selection who posted 75 tackles that season.
At Copperas Cove High School in Copperas Cove, Texas, Hollowell was a Class 5A all-state selection as a senior and became the school's career leader in tackles (311).