Make character disappear

I'm trying to have a NPC dissapear when he dies with the SetActorAlpha fonction but it does not seem to work is there or another way? or can someone tell me what is wrong with the script?

 begin OnDeath
  
  	set timer to timer + GetSecondsPassed
  
  	if timer == 1
  		saa 0.45
  	endif
  	if timer == 2
  		saa 0.40
  	endif
  	if timer == 3
  		saa 0.35
  	Message " As Fiy Rein's ghost disapears before you, you hear his voice in your head : 'Congratulations, you shall now bear my curse...' ", 12
  	endif
  	if timer == 4
  		saa 0.30
  	endif
  	if timer == 5
  		saa 0.25
  	endif
  	if timer == 6
  		saa 0.20
  	endif
  	if timer == 7
  		saa 0.15
  	endif
  	if timer == 8
  		saa 0.10
  	endif
  	if timer ==9
  		saa 0.5
  	endif
  	if timer == 10
  		saa 0.0
  	endif
  	if timer == 11
  		PlaceAtMe zzreinbrace
  		Player.AddSpell zzreinsab
  		ForceWeather Clear
  		ReleaseWeatherOverride
  		Disable zzFiyRein
  	endif
  
 end

--Hawkes 13:07, 12 April 2006 (EDT)