I seen to be having a problem with eye glowing continuing after death. I followed the tutorial foudn here:
https://www.ugx-mods.com/forum/scripting/50/glowing-zombie-eyes/2872

Here is the relevant code found within my
_zombiemode_spawners.gsc file:

// When a Zombie spawns, set his eyes to glowing.
zombie_eye_glow()
{
	if( IsDefined( level.zombie_eye_glow ) && !level.zombie_eye_glow )
	{
		return; 
	}

	if( !IsDefined( self ) )
	{
		return;
	}

	linkTag = "J_Eyeball_LE";
	fxModel = "tag_origin";
	fxTag = "tag_origin";

	// SRS 9/2/2008: only using one particle now per Barry's request;
	//  modified to be able to turn particle off
	self.fx_eye_glow = Spawn( "script_model", self GetTagOrigin( linkTag ) );
	self.fx_eye_glow.angles = self GetTagAngles( linkTag );
	self.fx_eye_glow SetModel( fxModel );
	self.fx_eye_glow LinkTo( self, linkTag );

	// TEMP for testing
	//self.fx_eye_glow thread maps\_debug::drawTagForever( fxTag );

	PlayFxOnTag( level._effect["eye_glow"], self.fx_eye_glow, fxTag );
}

// Called when either the Zombie dies or if his head gets blown off
zombie_eye_glow_stop()
{
	if( IsDefined( self.fx_eye_glow ) )
	{
		self.fx_eye_glow Delete();
	}
}

The glowing eyes just stay there even after the zombie despawns. It's a rather old issue that I have, so I thought I would get around to fixing it.

zombie_death_event( zombie )

wait 0.5;
while(1)
{
	if ( IsDefined( zombie.fx_eye_glow ) ) zombie.fx_eye_glow Delete();
	else break; // I think return; also works
}