Lincare, a giant respiratory-device supplier with a long history of fraud settlements and complaints about dismal service, is facing its latest legal challenge: a lawsuit that claims its failures caused the death of a 27-year-old man with Down syndrome.

The case, set to go to trial in state court in St. Louis on March 17, centers on the 2020 death of LeQuon Marquis Vernor, who suffered from severe obstructive sleep apnea and relied on a Lincare-supplied BiPAP machine to help him breathe while sleeping. The lawsuit, filed by his mother, accuses Lincare of negligence after the company took seven days to respond to her report that the device had stopped working.

Lincare, the largest oxygen-device supplier in the U.S., with $2.4 billion in annual revenue, has long faced an array of legal issues, but it’s rare for a claim of wrongful death linked to its service and equipment to go to trial. The litigation over what happened to Vernor offers an unusual window into the company’s interaction with a vulnerable patient. This account is based on extensive court filings, including medical records, deposition excerpts and Lincare’s internal “customer account notes.”