Summary:

Unreal Tournament kill streak announcements for PD2.
You can also toggle and position kill streak texts in the options menu.
Note: May contain foul language

Video Demonstration

How are kill streaks scored?

There are multiple types of kills that will play announcer commentary and display text
One time only

• First Blood - Plays only once at the beginning of each heist, if you're the first one to score a kill. Doesn't work if you joined mid-game for obvious reasons

Kill combos

• Double > Multi > Mega > Ultra > Monster > Ludicrous > Holy S*** play when you manage to score X amount of kills within 3 seconds,
  the chain can be sustained indefinitely, as long as you keep killing enemies within 3 seconds. This cycle resets after 3 seconds have passed without a kill.

Headshots

• Headshot plays when you score a killing headshot

Once per life / down
These play similar to kill combos, but they don't have a time limit and play only once per life. When you go down, the combo resets.
You go one step up for every 5 kills

• Killing Spree > Rampage > Dominating > Unstoppable > Godlike > Wicked Sick

Other

• Head hunter plays once per life after you score 15 killing headshots