Digital Goa, June 1- Mormugao police have registered a murder case against Baina resident Rahul Kumar Saini, after a youth he allegedly assaulted succumbed to his injuries while undergoing treatment at GMC, Bambolim. Rahul who is native of Bihar allegedly attacked Rajesh Majhe, also a native of Bihar, with a wooden rafter during a fight inside a rented room at Baina. The assault left Majhe with serious head injuries, following which he was shifted to GMC for medical treatment.