Dennis E. Dickey, a Border Patrol agent who has worked out of the Nogales Station, approached a Pima County sheriff’s deputy immediately after the Sawmill Fire broke out last month and acknowledged his target shooting sparked the fire, documents show. Dickey, who was off duty at the time, was identified in reports and recordings released Monday by the Pima County Sheriff’s Department that detail several 911 calls reporting the fire, from Vail to Green Valley.