The University of Pittsburgh Medical Center said in court papers that a lawsuit filed against it by the son of a woman who died after wandering away from her hospital room was full of "scandalous" and "irrelevant" claims. Rose Lee Diggs, 89, was found on the roof of UPMC Montefiore in December, hours after she had wandered away from her 12th-floor room. The lawsuit, filed by her son in the Allegheny County Court of Common Pleas, alleges negligence by hospital staff and includes claims that hospital workers attempted a cover-up by replacing a broken lock that led to the roof of the hospital where the woman was found.