Pervez Musharraf, Pakistan's former military ruler, has been charged with murder of former Prime Minister Benazir Bhutto, who died in a gun and bomb attack in December 2007, court officials say.br br The case of Bhutto's murder is one of several that Musharraf is facing since his return from self-imposed exile earlier this year.br br Al Jazeera's Imtiaz Tyab reports from Islamabad.