Trust me, i don't know how a mouse the same size can rip organs out of the body and eat the other stuff, i do know they bite But seriously, a mouse the same size could had eaten the same exact place and it would just be little of blood and it wouldn't be dead for sure, unless it bit alot or it bled out, i cant tell if i should go with the "OP killed it" theory or wait for another one to pop up, well if that happens.