(AP) — A man who authorities say fatally shot a caseworker at a hospital complex near Philadelphia and was then shot by his psychiatrist remains listed in critical condition. Authorities are trying to determine why a man identified as a patient fatally shot a caseworker at a hospital complex in a Philadelphia suburb and whether a psychiatrist who pulled out his own gun and wounded the patient had concerns about him. A spokeswoman for the Mercy Health System said the hospital has a policy barring anyone except on-duty law enforcement officers from carrying weapons on its campus. Court records in Delaware County show a man of the same name and age with a lengthy criminal record, but Whelan was unsure if it was the same person. Plotts, severely wounded from several shots, emerged from the office, and another doctor and a caseworker helped wrestle him to the floor of the hallway and grabbed his weapon, Whelan said. The exchange of gunfire occurred on the third floor of the Wellness Center at Mercy Fitzgerald, a 204-bed community teaching hospital. Authorities said there are no surveillance cameras in the doctor's office or the waiting area outside. Patients waiting in the first-floor lobby reported a tense scene when police arrived and ordered everyone out.