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? or can some 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)