The Office fans are mourning the death of Mark York, the 55-year-old actor who had a recurring role as Scranton Business Park property manager Billy Merchant between the sitcom’s second and fifth seasons. According to Variety:

Following a brief and unexpected illness, York died early in the morning on May 19 at the Miami Valley Hospital in Ohio. The Montgomery County Coroner’s Office confirmed his death, although the exact cause of death has not been disclosed.