The family member should be charged and convicted for causing the murder..
They didn't pull a trigger, the cops did. There are much better ways to compliance from people , than waking them from a deep sleep. This crap needs to change. They had no good reason to wake him up and put him under stress, it's almost a guarantee of a screw up by one side or the other.
Putting aside the lack of constitutionality, the method will get folks dead.