R. Brian Wentz told an associate he was going to Illinois , Bride Estrella Carrera says . Carrera had failed to pick up her two children , ages 2 and 8 , as scheduled the day before , police said . FBI tracks phone use from Mexico to Texas near the Mexican border . He told his sister that he and his new bride had `` a bad fight , '' and he left her bleeding . FBI , 26 , was found stabbed to death in a cocktail dress in the bathtub .
R. Brian Wentz told an associate he was going to Illinois , Bride Estrella Carrera says . FBI tracks phone use from Mexico to Texas near the Mexican border . He told his sister that he and his new bride had `` a bad fight , '' and he left her bleeding . FBI , 26 , was found stabbed to death in a cocktail dress in the bathtub .