I dont by the notion they leave you alone if the water is not murky. Could that one factor contribute to an attack, sure. A young man was bitten in half here not long ago. Water is not murky. These things are everywhere here in Chatham. They swim in groups there are so many. Its just a matter of time before someone else is killed. Way too many people in the water and its only getting worse.Dont swim when the water is murky, otherwise they leave you alone. There are many factors that prevent or contribute to attacks. I would be curious to understand what the conditions and water clarity was like. Google William Winram, a freediver who interacts with Great Whites and other sharks with no cage and when they are not already manipulated by us humans. Also, he expects the encounters and knows how to react versus surface swimming. Environment and conditions are big factors when this happens. The common perception is that they are a problem, the reality is how we affect their behavior and environment is a greater problem. Yes they are fierce, no they dont intentionally attack humans and this is very unfortunate. I feel for her family and friends and for this person who liked the sea enough to be in it.