John Joseph Jack Shanagher, 83, died on March 11, 2003, at Somerset Medical Center in Somerville, New Jersey. At the time his death was recorded as an ordinary hospital passing; later reviews of hospital records and toxicology flagged unusually high concentrations of digoxin and other drugs among several patients who had been at Somerset in 2002–2003.

Those anomalies, together with irregular medication requests and room entries, drew investigators’ attention to a critical-care nurse employed at Somerset during that period, Charles Cullen. Prosecutors later alleged Cullen administered lethal doses of heart medications, insulin and other drugs to multiple patients; Cullen was arrested in December 2003 and ultimately identified by authorities as responsible for numerous killings in New Jersey and Pennsylvania. Shanagher’s death was later publicly listed among the victims linked to Cullen’s actions at Somerset.

The revelation transformed a family obituary into evidence of a criminal pattern and prompted lawsuits and inquiries into hospital oversight and reporting.