The Dink Network

Why don't you create another sprite on the screen, that should call the procedure.
In your monster's main procedure, use:
int &caller = create_sprite(0,0,0,100,1);//just random numbers
sp_nodraw(&caller,1);
sp_nohit(&caller,1);
sp_brain_parm(&caller,&current_sprite);
sp_script(&caller,"caller");

now, the "caller" script:
void main(void)
{
int &monster = sp_brain_parm(&current_sprite,-1);
set_callback_random("woo",500,2000);
}
void woo(void)
{
//place here your procedure
//just refer to &monster
}

in the monster's die procedure, don't forget to add
sp_active(&caller,0);

Hope it works. I didn't test it.