The death of an expert witness whose report and deposition testimony rested on uncertain ground does not entitle his clients to a do-over with a new expert, a federal judge held Thursday.In a written opinion, U.S. District Judge Joan B. Gottschall denied a defense motion to reopen expert discovery in a lawsuit accusing Wexford Health Sources Inc. and two physicians of providing substandard care to inmate Donald Lee McDonald.Gottschall conceded courts sometimes allow a substitute expert to submit a new report after the …