Can enemies frozen by something other than Frost Nova trigger Shatter when killed?

Question

Frost Nova's Shatter rune claims that "A frozen enemy that is killed has a 50% chance of releasing another Frost Nova." Meanwhile, Ice Armor causes melee attackers to be chilled or frozen for 2 seconds, and a rune for Blizzard can freeze enemies.

If an enemy is frozen by something besides Frost Nova and killed while I have Shatter equipped, can it release a Frost Nova?

Answer 1

After testing¹ both the freeze effect from Ice Armor and from Blizzard, I've discovered that it is not possible to generate a Frost Nova when killing a frozen enemy unless that enemy was frozen with Frost Nova.

_{1: Because of the 50% chance of a Frost Nova on Shatter, it is statistically possible that in my testing I did not see the effect even though it could still be achieved. However, I tested roughly twenty freezings with each methodology, so that is extraordinarily unlikely.}