I thought this was good up until the last bit of it.
The ending was boring. No real twist or anything. The way it built up I was expecting some crazy twist, and was very disappointed that it ended without one. Just a "yeah, he did it."
Also, just as a side note, the kid hides the murder weapon, cleans all the evidence off of it because he didn't want his dad to get in trouble, but then all of a sudden he's shocked to find out his dad killed someone?