Lately, there has been a lot of talk about how irritability can be a sign of bipolar disorder.

Homicidal thoughts (beyond the fleeting ones we've all had) indicates an anger or fear issue . . . probably both if you go back far enough. Mismanaged anger can really screw up a person's life, even if no homicide ever occurs. It would be smart to discuss it thoroughly with a therapist. There is even an "Anger Quotient" test that can be administered.