Steven Johnson and his dog were found stung to death after they were attacked by a swarm of killer bees at a cliff near Tucson, Arizona. This is not the first time that killer bees have attacked and killed climbers and hikers in the US south west. In October 2012, a climber fell to his death after trying to escape a swarm of killer bees and in 2011 a couple was stung to death at their ranch in South Texas.