In this undated handout image from Mexico's Attorney General's Office, Arturo Beltran Leyva is seen.  A Mexican navy official said alleged drug cartel chief Arturo Beltran Leyva was killed in a shootout with sailors Wednesday Dec. 16, 2009. The official says Beltran Leyva and three other suspected members of his cartel were killed in a shootout with sailors at an apartment complex in the city of Cuernavaca, just south of Mexico City. Beltran Levya, known as the "boss of bosses," was one of...