<human>: Can you condense the text into three sentences or less?

So say I had a really close friend growing up (I promise it's not me, that's important to the story) who was abused by nearly everyone he came across.  By the time he was 14 he couldn't function in a school environment, he was far too angry and violent.  He had outbursts all the time and his dad put him on medication and didn't tell anybody.  Turns out he was stealing it from local pharmacies after hours.

My friend finally escaped, but shortly after he did, his father followed after him.  While fleeing, his father drove into a ditch and was nearly killed.  My friend got far enough away that he will now be next to impossible to find.

Remember, this is all hypothetical.  It's a thought exercise.

Now, the reason my friend finally decided to cut and run was because his wretch of a father murdered his girlfriend in their home after she threatened to rat him out to police for continuously breaking into their neighbors homes to support his raging drug habit.

Long sentence.

Anyway, the girlfriend was found with a broken neck in the bathtub and the husband crying on the floor.  House looks fine, no skin under his nails, no signs of foulplay, two teenaged boys in their rooms that look innocent enough.

From the beginning, my friend knew it was his father.  His father knew he knew.  He got out as quickly as he could.

The question:

Hypothetically speaking, should he alert the police?  This raving madman is after him still with a shattered pelvis, and my friend is honestly starting to get scared.  

The catch I mentioned is this: he's got a criminal record (mostly nonviolent offenses and some assault charges) about a mile long.  He is a delinquent, but he's not a bad person.  He's like a pit bull that's been locked in the closet for too long.  He's hungry and he's tired and he's defeated after all this shit.

So what should he do?
<bot>: Pretend Friend on the lam from his dad, who killed his girlfriend in a drunken rage -- what do, reddit?  Alert red and blues?  Contact lawyer?  Vigilante justice?