A patient at Oregon State Hospital died of a suspected fentanyl overdose on Friday, and Oregon State Police are investigating the circumstances, police said.

A spokesperson for the police agency confirmed the investigation to the Capital Chronicle late Friday but had no other details. Separately, the Oregon State Hospital sent a memo to staff on Friday and announced it is temporarily halting in-person patient visits with friends and family. The state-run psychiatric hospital in Salem has more than 600 patients.