SALT LAKE CITY, UTAH — A 15-year-old boy, initially charged with murder in a case that was initially declined as self-defense by the Salt Lake County District Attorney’s Office, appeared in juvenile court on Wednesday, marking a significant new development in his ongoing legal battle. Emiliano, who had previously entered a plea agreement for manslaughter in the death of a probation fugitive high on methamphetamine who allegedly robbed him at gunpoint, saw his plea agreement vacated. This latest move leaves the future of his case uncertain, as his attorney pushes for his release and the disqualification of the DA’s office…