Matthew Mattern, 22, of Shamokin, Pennsylvania, died on August 31, 1999, at Lehigh Valley Hospital in Salisbury Township. Hospital records list Matthew as one of the patients who received a fatal dose of digoxin while under the care of nurse Charles Edmund Cullen, who began working in Lehigh Valley Hospital’s burn unit in December 1998.

Cullen administered lethal overdoses of medications, including digoxin, to several patients during his time at the hospital. His killings occurred across multiple medical facilities over many years; he later confessed to murdering dozens of patients and investigators have linked him to a far larger number of suspicious deaths.

If anyone knew Matthew, his whereabouts in the days before August 31, 1999, or has information about his care at Lehigh Valley Hospital, please share what is known.