Manhattan’s Upper East Side witnessed a bloody incident on Tuesday night, when 56-year-old psychologist Kathryn Faughey was killed at her office on East 79th Street. Another therapist who witnessed the attack and tried to intervene got serious injuries on his face and had to be taken to the New York Presbyterian Hospital Weill/Cornell.

Police investigators arrived at the scene found the possible murder weapons, a meat cleaver and a knife, but the suspect was nowhere to be found. The motive for the horrible crime remains unknown and it still remains unclear whether the murderer was one of Faughey’s patients.

According to the investigators, the attack took place at around 9 p.m. in an apartment building at the corner of York Avenue. The victim was pronounced dead at the scene after a doorman reported the incident to the authorities.

Kathryn Faughey, who lived just across the street from her office, was attacked and stabbed to death multiple times. One of her work colleagues, who tried to come to her aid, ended up in the hospital with serious wounds, but is expected to survive.

According to police investigators at the scene, the killer clearly was very angry and it was probably a personal matter that drove him into the mad killing. This could mean that the victim was attacked by one of her patients, but that has not been confirmed yet.

The suspect was seriously deranged, as he managed to bend the murder weapons during the assault, according to the police. “The place was trashed,” a police source said according to nydailynews.com. “There was some violent struggle. Her blood was all over her office.”

According to witnesses, the suspect fled through the basement, but the investigators haven’t managed to get a hold of him yet, and he is still at large. All of Faughey’s friends, colleagues and neighbors were in shock after the terrible incident.