(Reuters) - Oracle Corp co-Chief Executive Officer Mark Hurd has died, the business software maker said on Friday, an unexpected development that raises pressure on co-CEO Safra Catz to lead the company's ongoing transition to cloud computing.Hurd, 62, went on medical leave last month, with Catz and founder Larry Ellison taking over his responsibilities during his absence. The company did not provide any further details at the time.Hurd and Catz were named co-CEOs in 2014, after Ellison decided..