Antimatter Explosion in a Star?

In 2004, a giant Wolf-Rayet star (which begins life 40 times the mass of the Sun) explosion was observed by astronomers. This explosion did not end the star's life, but in October 2006 they witnessed that it went through yet another explosion ... one which ended in the death of the star.

One theory being presented is that the power of the first explosion resulted in the creation of antimatter. This antimatter creates an instability within the star resulting in a series of further energy releases inside the star until finally destroying the star in the second massive explosion.

For more information, see the New Scientist article Star's odd double explosion hints at antimatter trigger.