The longtime leader of an Arizona long-term care facility resigned Monday, following reports that a patient in a vegetative state was sexually assaulted and recently gave birth to a baby.

CEO Bill Timmons has immediately ended his employment with the Hacienda HealthCare after 28 years in the role, the Phoenix-based provider announced in a statement. The resignation comes after a woman — left in a chronic state of brain dysfunction from a near-drowning more than a decade ago — gave birth to a healthy baby boy in December.

Hacienda’s board unanimously accepted Timmon’s resignation. In a statement, board member Gary Orman said they want “nothing less than a full accounting of this absolutely horrifying situation, an unprecedented case that has devastated everyone involved, from the victim and her family to Hacienda staff at every level of our organization,” the Arizona Republic reported. Phoenix officials are now investigating the circumstances surrounding the patient’s pregnancy. No one has been arrested in the incident.

“We will continue to cooperate with Phoenix Police and the investigating agencies at all levels in every way possible,” Orman said in his statement. “And we will do everything in our power to ensure the safety of every single one of our patients and our employees.”

The case has drawn national media attention. In a statement, the office of Arizona Gov. Doug Ducey (R) called the incident “deeply troubling.” State officials have dispatched investigators to conduct health and safety checks at Hacienda and required it to heighten security to ensure patient safety, the Washington Post reported. The 74-bed nursing facility specializes in care for individuals with intellectual disabilities and is located about seven miles south of downtown Phoenix.