The Detroit Lions Monday released defensive back Lionel Smith, who was on the team's practiced squad a year ago. He was a final cut last year of the Dallas Cowboys after being an undrafted free agent from Texas A&M. The Lions are not confirming reports that they have signed offensive guard Leroy Harris. They have been looking for a veteran guard since releasing Stephen Peterman in February. Harris was a three year started for the Tennessee TGitans, but he was sidelined last November by a right knee injury.