Kemoeatu played four seasons with the Baltimore Ravens from 2002 to 2005. He was originally signed as an undrafted free agent in 2002.
Kemoeatu signed with the Carolina Panthers as a free agent in 2006.
Kemoeatu suffered a torn right Achilles' tendon during the team's 2009 training camp. He was placed on season-ending injured reserve on August 5. He was released on March 5, 2010.
On March 13, 2010 Kemoeatu signed a two year, $7 million contract with the Washington Redskins.