By Mark Lamport-Stokes LOS ANGELES (Reuters) - The Los Angeles Lakers appointed former player Byron Scott as their new head coach on Monday, bringing an end to their "extensive and thorough" search for Mike D'Antoni's replacement. Scott, 53, was a three-time NBA champion with the Lakers during their triumphant 'Showtime' era in the 1980s and has worked as a head coach in the league for 13 years .