[TomGuy]

when trying to rule out an accident.

It would seem that the 911 call ruled out 'accident'.

Dispatcher: Okay, so what'd you do?
Martin: I shot him with a 410 shotgun twice.
Dispatcher: You shot him with a shotgun? Where is he?
Martin: He's laying in his yard.

[Joe 6-pack]

Doesn't matter. Even formal written admissions get thrown out fairly regularly when things go to court. What may seem at first to be supporting or secondary evidence may become the centerpiece of the prosecution's case.