OXNARD, Calif. — The Dallas Cowboys added depth to their defensive line Friday, signing free agent Ken Boatright. His agent, Brett Tessler, announced on Twitter that it is a two-year deal.Boatright signed with the Seattle Seahawks as a undrafted free agent out of Southern Illinois in 2013. The Seahawks cut him last August, but he spent time with them last season before they released him in June.The 6-4, 253-pounder tweeted that he was "looking forward to starting my next chapter" with the Cowboys. He added he was "so grateful to have a second chance to play the game I love."The Cowboys also worked out defensive ends Cory Henry and Adewale Ojomo on Friday in Oxnard and could sign Ojomo, according to a source.They are desperate for help in the defensive line after DeMarcus Lawrence fractured his foot Tuesday. Four other defensive linemen are sidelined, too.