I keep having these dreams of being murderd or my family be murderd. These dreams are so real to me, the last one I was telling myself this is not real wake up please, as I was dreaming of this man going to stab me after he had already stabbed my husband. Its making me afraid to be alone. I'm always looking over my shoulder for someone. This all started when my friend come up missing out of her home. Leaving her two children alone. So my question is. Has anyone had this problem and how did you deal with it.

It is most likely your fear from your friend missing.
Dreams rarely mean what they seem. Often being murdered in a dream means something figurative like your best friend turning on you and doing you wrong.
I would have to look it up again to remember the other things it can mean. If there is anything significant I will do a follow up.
But it most likely is your fear entering your dreams.