Is there a way to check if Mario's DeathState is active? I'd like to execute something when Mario dies.

I know you can set his DeathState to this to kill him, and have the standard death animation.
mario->DeathState = 0x21197FC;

Kind of looking for something like this.
if(DeathState == TRUE)
{
//Do something
}

Maybe just hook MarioActor::update() and check for that yourself?
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GitHub - Kuribo64 - YouTube

I have with other parts of his struct.
I've had success doing it with the power up state.

void hook_0211F83C_ov_0A()
{
MarioActor* mario = (MarioActor*)getPtrToPlayerActor();
u8 PowerState = mario->marioPowerupState;
}

I can use the PowerState to check if certain powerups are present but I can't seem to with the DeathState.
For example, if I set mario->DeathState = 0x21197FC and then check to see if it's equal to 0x21197FC, I'm not getting any results.

Yes, because the DeathState gets assigned a completely random constant value during game-play, but never seems to be assigned any of the death values. (I've checked before)