That is what happens when the body is starved for oxygen, the heart stops.
Coroners like to use "heart failure" as COD. It is never not correct. They often fail to include the heroin overdose or other factors which actually caused the heart to quit beating.
Less traumatic to the family that way and all that. Or perhaps even, less liability to the governing body paying his salary. Thus the necessity of an autopsy performed by a non government entity.
