Kitna started four games for the Lions in 2008 completing 68-of-120 attempts for 758 yards with five touchdowns and five interceptions before landing on injured reserve with a back injury on October 14, 2008. Kitna was on the last year of his contract at $1.95 million. He'll be expected to take over the No. 2 quarterback role for Brad Johnson who was released earlier this week.
As Scout.com has speculated for some time, Henry's job was in jeopardy because of a $1 million roster bonus which was due soon and Dallas selected CB Mike Jenkins in the first round of last year's draft.
Detroit is still thought to be in need of cornerback help and as first reported on Friday, they were scheduled to have free agent Jabari Greer in for a visit.
A former fifth-round pick, King isn't necessarily starting material, but will be a special teams contributor and provides depth at the position.