"William Barrett Carnahan"@en . . . . . "Barrett Carnahan"@en . . . "Barrett Carnahan"@en . "Constantine"@en . . "Barrett Carnahan played David in the season twelve Grey's Anatomy episode My Next Life."@en . . . . . . "Barrett Carnahan played David in the season twelve Grey's Anatomy episode My Next Life."@en . . "GA: 12"@en . "Ohio"@en .