Reverend Gall’s death turned a hospital concern about abnormal medication results into a homicide investigation. The inquiry focused on digoxin access and canceled drug orders, and later toxicology confirmed that Gall had died from digoxin poisoning. But the evidence that could establish the death as homicide still fell short of proving who had caused it, leaving the investigation dependent on records, clinical judgment, and the difficult cooperation of Amy Loughren, Cullen’s friend and colleague.

Background and Hospital Response

Gall died on Saturday, June 28. On Monday morning, nurse Marty Kelly asked to meet with Risk Manager Mary Lund; Lund called a meeting for the following day with medical, pharmacy, laboratory, critical-care, and risk-management staff. Among the measures that followed, the pharmacy was asked to examine Pyxis access to digoxin in the Critical Care unit around the times of abnormal laboratory results. Staff also contacted the New Jersey Poison Control Center for information about what dose could produce a serum digoxin level of 9. The review focused particularly on Gall and Mrs. Han, and on canceled drug orders in the Pyxis reports.

The hospital’s response unfolded amid other suspicions about unexplained patient abnormalities. At a separate discussion of patients with strange glucose results, Bruce Ruck raised the question of whether insulin and C-peptide levels had been tested; Mary Lund confirmed that the results correlated. The endocrinologist’s assessment, as relayed at the meeting, was that at least one case was difficult to explain without an exogenous influence. These insulin findings were not themselves proof of what happened to Gall, but they formed part of the atmosphere in which staff and investigators were considering whether patients had been deliberately exposed to drugs.

The Investigation and the Forensic Finding

The Gall toxicology report arrived at 10:38 on the morning of November 29, 2003. Its extensive list of negative findings covered roughly ninety-six drugs, from acetaminophen to zolpidem. What it did find was digoxin: 23.4 micrograms per liter in the vitreous fluid, 32.0 micrograms per kilogram in the spleen, 40.8 in the heart, and 104 in the kidney. The results allowed Nobby C. Mambo to amend the report’s findings: cause of death, digoxin toxicity; manner of death, homicide. Investigators now had both a murder victim and a likely murder weapon.

That forensic conclusion did not establish the killer. The Somerset County Prosecutor’s Office team met twice a day, and Pyxis reports alongside Cerner electronic health record printouts formed its largest body of evidence connecting Charles Cullen to drugs that had killed Gall. The records could show that Cullen had been able to obtain medication; they could not, on their own, prove that he had used it to kill Gall. He could claim that medication orders were valid, and the investigators could not conclusively distinguish deliberate cancellations from mistakes. With Cullen no longer working at the hospital, catching him in the act was no longer a safe or practical option. Investigators concluded that they needed him to confess to a crime, or at least disclose one to someone he trusted.

Amy Loughren and the Pyxis Printout

Amy Loughren’s involvement began in a climate of rumor and fear. Colleagues knew her as Cullen’s friend and remembered that she had resisted signing an insulin adjustment form because she considered its estimate of the amount remaining in a vial unreliable. The nurses also heard that a death, insulin, and Cullen were somehow connected. Some avoided Amy, and she feared that the investigation might implicate her or put her nursing license and employment at risk. Her insistence on understanding what had happened collided with the hospital’s unwillingness to explain the new protocol.

When a detective showed her a Pyxis printout from the night Gall died, Amy recognized Cullen’s activity on it. Until then, she had defended him against accusations she considered unfair; the page made it possible for her to imagine that he had done something terrible, even though she could not reconcile that possibility with her image of her friend. Her reaction was not an immediate, uncomplicated break with him. She wrestled with whether she could deceive Cullen, her employer, and others to help the detectives, especially because they were strangers and might be wrong. The choice threatened both her loyalty to a friend and her sense of safety at work.

Amy eventually took risks beyond discussing the printout. She reviewed investigative paperwork, brought detectives stacks of material after her shifts, and told them that the Cerner patient records could be important in their complete, unaltered form. While a subpoena was being prepared, she used her own access to help gather records, carrying a larger purse to work. She continued to feel exposed and alone in having broken ranks, but seeing Tim Braun and Danny Baldwin work on the investigation made her feel somewhat less isolated and more courageous.

Consequences and Significance

The case’s central reversal was also its central evidentiary limit: what had first appeared as unexplained laboratory abnormalities was ultimately classified as a homicide, yet that classification did not identify the person responsible. Gall’s toxicology transformed suspicion into a confirmed poisoning death; the medication records supplied a possible connection to Cullen, not proof beyond that connection. The distinction shaped the next stage of the investigation, which turned toward Amy’s knowledge of Cullen and the possibility that he might reveal his crimes to someone he trusted.

For Amy, the case made professional and personal trust inseparable. She was a nurse trying to protect patients, a colleague who had questioned a procedure without being told why it mattered, and a friend confronting evidence that unsettled her loyalty. Her participation carried a real risk to her job and standing, even as she believed the records could help clarify what had happened. Gall’s death thus became not only a forensic case but also the point at which an investigation’s need for evidence entered the private bond between Amy and Cullen.