I'm so angry lately, I feel like I'm going to snap and do something that hurts someone.
Wow, that sounds really intense. Why do you feel so angry?
I'm frustrated over my father's murder, the police have no leads and the people that did this are getting away with it.
It's understandable that you want to get revenge on the people that killed your father. I know you are frustrated but you need to think with your head and not with your fist. Let the authorities deal with this, you have too much to lose if you end up in jail.
I can't stand by and do nothing for much longer. I'll never be able to rest until his killers are brought to justice.
It sounds like you're dealing with a lot, but you have to let the justice system take the time it needs to catch these people. Speak to a therapist that can help you work through your emotions. I think you really need to get some help.