sentences:  Investigators found that nurse Filipina Narciso had been on duty in the relevant ward during every poisoning, and she was identified by a patient as the nurse who injected something into his IV just before his breathing suddenly stopped.Nurse Leonora Perez was also identified by another patient as having injected his IV just before his respiratory arrest occurred, but he—like the patient who had identified Narciso—died before the trial.The case against Narciso and Perez was considered by assistant U.S. Attorney General Richard Delonis to be "highly circumstantial", although the defense lawyers felt it was strong enough that they had to put their clients on the stand, where in the event they appeared evasive.