diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 57df4f98c0..cd78d4d9d0 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,3 +1,7 @@
+December 12, 2009
+- Added a damage type parameter to A_KillChildren, A_KillMaster, and
+  A_KillSiblings. 
+
 December 11, 2009  (Changes by Graf Zahl)
 - fixed: Auto-COMPAT_SHORTTEX for IWADs must be set per IWAD, not in general
   for Doom.
diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index d1c9f40836..441304ea18 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -1951,11 +1951,14 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_JumpIf)
 // A_KillMaster
 //
 //===========================================================================
-DEFINE_ACTION_FUNCTION(AActor, A_KillMaster)
+DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_KillMaster)
 {
+	ACTION_PARAM_START(1);
+	ACTION_PARAM_NAME(damagetype, 0);
+
 	if (self->master != NULL)
 	{
-		P_DamageMobj(self->master, self, self, self->master->health, NAME_None, DMG_NO_ARMOR);
+		P_DamageMobj(self->master, self, self, self->master->health, damagetype, DMG_NO_ARMOR);
 	}
 }
 
@@ -1964,16 +1967,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_KillMaster)
 // A_KillChildren
 //
 //===========================================================================
-DEFINE_ACTION_FUNCTION(AActor, A_KillChildren)
+DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_KillChildren)
 {
+	ACTION_PARAM_START(1);
+	ACTION_PARAM_NAME(damagetype, 0);
+
 	TThinkerIterator<AActor> it;
-	AActor * mo;
+	AActor *mo;
 
 	while ( (mo = it.Next()) )
 	{
 		if (mo->master == self)
 		{
-			P_DamageMobj(mo, self, self, mo->health, NAME_None, DMG_NO_ARMOR);
+			P_DamageMobj(mo, self, self, mo->health, damagetype, DMG_NO_ARMOR);
 		}
 	}
 }
@@ -1983,16 +1989,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_KillChildren)
 // A_KillSiblings
 //
 //===========================================================================
-DEFINE_ACTION_FUNCTION(AActor, A_KillSiblings)
+DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_KillSiblings)
 {
+	ACTION_PARAM_START(1);
+	ACTION_PARAM_NAME(damagetype, 0);
+
 	TThinkerIterator<AActor> it;
-	AActor * mo;
+	AActor *mo;
 
 	while ( (mo = it.Next()) )
 	{
 		if (mo->master == self->master && mo != self)
 		{
-			P_DamageMobj(mo, self, self, mo->health, NAME_None, DMG_NO_ARMOR);
+			P_DamageMobj(mo, self, self, mo->health, damagetype, DMG_NO_ARMOR);
 		}
 	}
 }
diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index 51513e10c4..117a29ac81 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -209,9 +209,9 @@ ACTOR Actor native //: Thinker
 	action native A_RemoveMaster();
 	action native A_RemoveChildren(bool removeall = false);
 	action native A_RemoveSiblings(bool removeall = false);
-	action native A_KillMaster();
-	action native A_KillChildren();
-	action native A_KillSiblings();
+	action native A_KillMaster(name damagetype = "none");
+	action native A_KillChildren(name damagetype = "none");
+	action native A_KillSiblings(name damagetype = "none");
 	action native A_RaiseMaster();
 	action native A_RaiseChildren();
 	action native A_RaiseSiblings();