"We will go back and look at the full history of the individuals, that which is known to police and that which is not known to police, to try and identify if there was a pattern or the presence of domestic violence in this relationship," he said. North Queensland Domestic Violence Resource Service co-ordinator Mandy Thompson said events like this were the group's "worst nightmare" and brought home the serious nature of violence in domestic and family settings. "These are the things we try to prevent every day," she said. Police on scene. "What may seem like a small incident may escalate to a tragedy." she said.