D4vd appeared in a Los Angeles courtroom Tuesday looking weary in an orange prison jumpsuit as a preliminary hearing in his murder trial was delayed due to a mountain of new evidence, prosecutors said. The decision to delay the hearing until the end of June came after horrifying new details emerged last month in the case of his alleged mutilation of 14-year-old Celeste Rivas. Prosecutors revealed Tuesday that they have tons of evidence to review, including lab reports, police reports, photographs, numerous videos, arrest reports and forensic evidence. D4vd, real name David Burke, at his arraignment in April.…