How Do You Stop Homicidal Urges?

This is a serious question...Every 5 minutes i have homicidal thoughts. some are short, just thinking of dead people; like shootings or crashes. But others are long, thinking of killing someone and imagining the whole scenario flawlessly. Sometimes i feel a very strong urge to go and kill someone. I just want to know anything that would help stop me before i follow the urge. Thank you in advance.