The estate of a man who died two days after undergoing brain surgery has settled its lawsuit for $6 million.Plaintiff Jeanette Horne sued Rush University Medical Center and neurosurgeon Demetrius Lopes in 2013, alleging Lopes failed to identify and address a fatal bleeding problem he caused while attempting to repair her husband Billy’s aneurysm.Physicians identified an aneurysm in Horne’s brain while performing a work-up for vertigo on him, according to the lawsuit.Lopes told Horne a month later that he could …