Six-year-old boy killed by jellyfish in Australia.Pravda,ru. Nov.13, 2007. A six-year-old boy is believed to be killed by notorious jellyfish while swimming off Australian beach. He died within several minutes after being stung.The boy died Sunday in the Tiwi Islands north of the city of Darwin, after running from the sea complaining that something had stung him, said Northern Territory Police spokeswoman Katie Fowden. [ See ]