Billy Jean is expecting that Michael will be leaving certain assets to her and her child, Michasel Jr. After Michael's tragic death in a motorcycle accident, Billy Jean waits expectantly for news about Michael's will. She understands it will need to go through probate; however, she is surprised to find out that based on an "unfortunate situation" the will may not be admissible to probate. Please list at least three possible reasons that would explain why Michael's will may not be admissible to probate.