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ORCHARD PARK, N.Y. (AP) _ The Buffalo Bills released safety Raion Hill and kicker Shayne Graham, while also bolstering their lineup by signing 12 undrafted free agents.

Hill, a two-year veteran, struggled despite starting 13 games last season before losing his job to Pierson Prioleau. He became expendable after the Bills signed free agent Billy Jenkins earlier this month.

Graham, who made six of eight field goal attempts last year was released two weeks after the Bills signed veteran free agent Mike Hollis.

Pittsburgh quarterback David Priestly headed the list of undrafted free agents signed by Buffalo. During Pitt's season-ending six-game winning streak, Priestley completed 59.7 percent of his passes for a 245 yards per game average, with 15 touchdowns and one interception.

He will compete against returning veteran Travis Brown for the Bills No. 3 job.