[AnotherUnixGeek]

Stephen Craig Paddock (April 9, 1953 - October 1, 2017) was an American mass murderer

And mass murderer and a terrorist. A guy who perches above a crowded concert and mows down people with an assortment of automatic weapons is, by definition, a terrorist.

[Mr.Unique]

... is, by definition, a terrorist.

I've seen many folks here and around the net hammering this point.

The definition of terrorist seems to be slowly changing.

Webster says a terrorist is a practitioner of terrorism, and terrorism is:

the systematic use of terror especially as a means of coercion.

We don't know enough to make that call yet.

[Flying Circus]

While he created terror, he is not a terrorist unless the terror he created has a specific intent to affect others behavior through coercion.

If he killed all those people because he wanted to go out with a bang and be famous in death, then he isn’t a terrorist.

If he killed all those people because he thought they tended toward a set of beliefs or behaviors he was opposed to and thought he could turn people away from the those actions or beliefs by his actions then he is a terrorist.