The definition of murder was made long ago, before the "state" existed. The "state" has classified and codified it, and enforces its prosecution.
What those two escapees did was murder under either definition.
One killed while in the act of stealing from a gun store. The victim was shot and run over.
The other one killed after kidnapping and torturing his victim, then dismembered the body and tossed the parts into the river.
