Someone is Assaulting Stephen Hawking?

It seems too grotesque to believe that someone would be repeatedly assaulting Stephen Hawking in his home, but police are investigating: Hawking's nurses questioned over 'assaults'. The evidence includes cuts and bruises observed on Hawking, but the alleged victim—paralyzed, brilliant, confined to a wheelchair and dependant on a voice box—is not cooperating with the investigation, which also sounds pretty odd.