The alleged murderer was her boyfriend and is in police custody now. Beacon Hill has many cameras covering the entrance and security house and boom and on the beach and walkway to beach so if someone causes robbery or mayhem etc. there is a great likely that they will be caught on one or more cameras. Beacon Hill area also has neighborhood and Beacon Hill crime WhatsApp group chat sites. Great deterrent to crime and also helping keep neighbors informed .
Unfortunately DOMESTIC ABUSE is hard to monitor as this might be what happened in this case. The suspect had a police record of female abuse etc.