A Malibu mystery: A string of shootings, a scientist killed and questions detectives can’t answer

It was just before sunrise at Malibu Creek State Park when the shot rang out in the pre-dawn silence.

A bullet whizzed into the tent of Tristan Beaudette, who was camping with his two young daughters. Beaudette, a research scientist from Irvine, was killed, his body discovered by others.

The killing…