The parents of a 15-month-old boy who died of fentanyl poisoning in September have been charged with the toddler’s murder. The Riverside County District Attorney’s Office added a murder charge at 22-year-old Adler Metcalf’s initial court appearance, KTLA reported. He had previously been charged only with child endangerment. The boy’s mother, 20-year-old Sandy Acuna, is …