why the bee will die after it stick the person ?

When a bee stings, barbs in the lance of the sting cause it to firmly stick into the victim pulling out the venom sacs and glands when the bee is shaken off. The venom sac muscles continue to pump after these organs have been torn from the dying bee. Only the female workers and the queen can sting, the queen having a smooth sting which she uses to kill other queens." this info found at: http://www.bbka.org.uk/faq.php which probably has more info on bees/wasps than you ever wanted to know loL!