Fentanyl Patch: New Wrongful Death Claim According to court documents, on June 19th, 2012, Tracy King filed a wrongful death claim at Philadelphia’s Common Pleas Court (case no. 120602334) alleging that her sister’s death was caused by a Fentanyl pain patch. Fentanyl (brand names Duragesic, Onsolis and others) is a potent synthetic narcotic analgesic used to treat breakthrough cancer pain and is commonly used in pre-procedures as a ... [News Source]