I have a coworker who has exhibited signs of aggression, harrasment, and abuse since I was hired a year and half ago. While there are formal forums for complaints against management there are no formal forums for complaints against coworkers. Everyone who has worked with this individual has complained of incidents to the office manager; however, the office manager does not discipline the individual instead he disciplines the entire office and ultimately places responsibility on us for resolving the issue. I have good reason to believe that this person suffers from Delusional Personality Disorder and I fear the day that this person comes to work with a shot gun. More recently this individual has begun to target my co-worker with sexual harrasment, slander, and even physical abuse in the form of slapping. This individual has also been known to expose herself, throw objects, and basically exhibit all the signs of a severe adult temper tantrum. Personally I have only suffered verbal abuse and slander but I have been witness to other acts of aggression and abuse. I have no hard evidence - just verbal complaints and coworker eye witnesses - all hearsay. What can I do? Is there anything in the law that requires employers to respond to signs of severe mental illness before violence occurs? Or do we have to wait until someone dies to put up a stop sign?