Authorities in Dallas County have confirmed three heat-related deaths in what has become one of the most sweltering Texas summers on record. The Dallas County Medical Examiner's Office says the deaths began in June, and forecasters say the worst may still be ahead. Highs around Dallas reached 104 degrees Saturday, marking the ninth straight day of triple-digit temperatures. The National Weather Service says July ended as the fourth-hottest in history for the Dallas area. Dallas County authorities say the heat-related deaths were two men, ages 49 and 84, and an 82-year-old woman. Forecasters expect the high around Dallas on Sunday to reach 107 degrees, which would be a record for this year.