is there a list of teammate reference ? i like to know if my companions kill creature by using iskiller function but i do not know how to obtain teammate refs or is it other way to tell if crature was killed by companion ? i could do refwalking with nvse but do not know a name or number of teammate list just like there is a list for all actor ( 200: Actor (for ref walking only) in fose docs), maybe there is some function that returns actor refs that killed creature co i can then use function RefName.GetPlayerTeammate to say if killer is my teammate. ??

Begin OnDeath . May mean multiple script blocks, since it's a condition on the Begin function itself.

If the "Add item on death" perk entry adds to NPCs that you and your companions kill (in the same way you get XP and Karma for companion kills) then you could give the player a perk with it, then add a scripted item to their inventory that checks if their killer was the player. If not, then they were killed by a companion.

no easier way ?

Unlikely. A GetKiller function would be nice, but since they had no need for it when making the game, it's not present.

strange it is sinc if there is iskiller so there must be somewhere the refference to killer put in killed actor so it should be so easy to add that imho intresting function.

Aha, unfortunately it's not 'easy' per se- ask the NVSE crew. The problem is whilst the info is certainly floating around in memory, finding out *where* in memory is not a trivial task.