Show Attack Heli killer

Hey, quick question.
Is it somehow possible to show the name of the player who actually shot down the attack heli? 
I tried to simply add "by {killer}" at the end of the message, but that doesn't seem to work. The name just doesn't show up. So is there any other way?

Thanks

},
{
"KillerType": "*",
"VictimType": "PatrolHelicopter",
"DamageType": "*",
"Messages": [
"The {victim} was finally shot down."
]

Merged post

This has changed this month though. Not sure why it doesn't work anymore. It used to be just "Helicopter" as the victim/killer. I changed it to Patrolhelicopter to see if that would show up...waiting on response on another thread.