Gunmen shot to death the Pakistani government's top prosecutor ... in a case that accuses former military ruler Pervez Musharraf of involvement in the 2007 assassination of ex-Prime Minister Benazir Bhutto, police said. The gunmen opened fire on Chaudhry Zulfikar's car as he was leaving his home. The assailants escaped. Chaudhry Zulfikar was involved in a number of high-profile cases. Zulfikar's slaying was a rare episode of violence in the capital, which has so far seen none of the bombings or other attacks launched by the Taliban against secular politicians. Musharraf, who ruled Pakistan for nine years before going into self-exile in 2008, returned in March in an ultimately futile bid to run for prime minister. He has been under house arrest for more than two weeks, facing allegations in various cases linked to his tenure. In the case unfolding in Rawalpindi, prosecutors allege that Musharraf was culpable for Bhutto's murder for not providing her with enough security. He has denied the allegations. Bhutto's son, Bilawal, who now leads the Pakistan People's Party, has alleged that Musharraf was behind it. Proceedings in the case have been bogged down for years, and resumed only recently with Musharraf's return. Speculation was rife ... that Zulfikar was killed to disrupt that case.