Photographer Trent Bell in front of two of the pieces in his show at Engine art gallery in Biddeford. His exhibit combines prisoner photos with letters to their younger selves. Behind Bell at left is Wesley Knight, 44, convicted of murder. At right is Peter Mills, 55, convicted of gross sexual assault, unlawful sexual contact and assault.

Robert Forrest, 67, murder

Robert Payzant, 46, robbery and aggravated assault

Jack Haycock, 41, drug trafficking

Brandon Brown, 26, attempted murder

Wesley Knight, 44, murder