Pakistani politician Zahra Shahid Hussain, was shot to death Saturday on the eve of a highly contested re-run of balloting in her district, police said. Hussain was killed in what sources described as an execution-style attack, according to a report of CNN. The killing came one day before voters cast ballots for the second time this month for one national and two provincial assembly seats in Karachi following allegations of vote rigging in early balloting. Hussain was the vice president of the Tehreek-e-Insaf party, the political group headed by former cricket star Imran Khan. "I am totally shocked and deeply saddened, and still cannot believe anyone would kill such a gentle lady," Khan said in statement. Pakistan's election commission scheduled a new vote in Karachi for Sunday, saying additional security measures were being taken to protect ballots.