Pennsylvania State Police Investigation of Charles Cullen

The Pennsylvania State Police Investigation of Charles Cullen grew from a nurse’s refusal to accept her hospital’s answer about a series of unusual deaths. Investigators assembled a substantial body of witness testimony and medical records at Saint Luke’s Medical Center, but could not turn suspicion into proof that would support a prosecution. Its unresolved findings became part of the record confronting later investigators in New Jersey: a strong suspect and a troubling pattern, but no established murder case.

Origins and escalation

Pat Medellin, a nurse at Saint Luke’s, had noticed unusual deaths on her unit. She had also seen Charles Cullen marched out after being caught diverting dangerous medications. Medellin believed he was responsible for the deaths and pressed hospital administrators to act. They told her Cullen had not harmed patients, and the hospital closed its investigation. The institutional conclusion did not settle the matter for Medellin.

On August 29, 2002, she took her account outside the hospital, telling an acquaintance who worked as a police officer. The report moved up through successive channels: the officer told a captain, the captain brought it to the coroner, and the coroner carried it to the Lehigh County District Attorney’s Office. Pennsylvania State Police troopers then interviewed Saint Luke’s staff. Their accounts of deaths on the night shift were, in the investigators’ assessment, damningly consistent.

The investigation had the ingredients of a serious homicide inquiry. When Danny Baldwin later received a briefing from Corporal Gerald Walsh and Troopers Egan and Bruchak, he learned that Pennsylvania investigators had bodies, physical evidence, dozens of cooperative witnesses, and a strong suspect. Yet the case had no happy ending. Those assets had not resolved the hardest question: whether investigators could prove that Cullen had killed a particular patient.

The pattern reported by nurses

Several nurses described patients who had seemed to be recovering, only to die suddenly after Cullen changed their IVs. Lynn Tester noticed the pattern among patients who had been on the mend. Robin Saulsberry recalled seeing Cullen slip out of a patient’s room shortly before that patient unexpectedly coded and died. She was also struck by how intently he watched the unit’s EKG monitor, even while speaking to her.

Saulsberry held a PhD in chemistry and believed the patient might have received Pronestyl, a drug Cullen had been found dumping from the medication shelves. Her account connected an observed change in a patient’s condition with a particular medication, but it remained an interpretation of the evidence, not proof of what had been administered or by whom.

Tester tried to measure how often Cullen was present when patients died. Although he worked only 26 percent of the hours, she calculated that he was present for 58 percent of the deaths. Another nurse recalled that the CCU averaged twenty to twenty-two Code Blues a month while Cullen worked there, then had no code for six months after he left. These accounts gave investigators a striking contrast between Cullen’s shifts and the unit’s subsequent experience. They raised the force of the pattern without, by themselves, establishing individual causation.

Records, medical review, and limits of proof

The case also turned on the gap between what staff suspected and what hospital records could demonstrate. Saint Luke’s supplied seventeen patient charts for review by outside medical pathologist Dr. Isidore Mihalakis, who had previously been involved in investigating Helen Dean’s suspicious death at Warren Hospital. After months of examining the charts, he found nothing prosecutable in the paperwork. Coroner Zachary Lysek worried privately about how many deaths Cullen might be responsible for, but recognized that a number, even a frightening one, could not substitute for scientific certainty.

Cullen’s personnel file offered little help in closing that gap. It described an unremarkable resignation after repeated reprimands and recorded that he should not be considered for rehire because of a medication issue. It did not name vecuronium bromide, the other powerful drugs Cullen had stashed and used, or a specific patient he had intentionally overdosed. Saint Luke’s administration may not have had concrete evidence to establish a deliberate overdose in an individual case. At the same time, investigators could see that the hospital’s handling of the matter had left a minimal paper trail and reduced its own legal exposure.

Closure and its afterlife

The Lehigh County District Attorney closed the case only five months before Tim Braun and Danny Baldwin began their investigation. The Pennsylvania inquiry had consumed eight months, but its work was, from a prosecutorial standpoint, a waste of time and paper: investigators could not be sure they had established a victim, much less prove Cullen was responsible. Braun understood that simply repeating the same road with fewer resources, fewer witnesses, and less physical evidence offered little reason to expect a different result.

The case’s closure did not erase what Pennsylvania investigators had gathered. It left later investigators with nurses’ accounts, a troubling pattern in deaths and drug access, and a clear warning about the distance between suspicion and a conviction. The investigation showed both the value and the limit of a cluster of converging clues: repeated observations could make Cullen the focus of scrutiny, but the records and medical reviews had not yet supplied the decisive link between his actions and a specific death.