I saw one today, along with a Garden Orb Weaver, and some other kind of HUGE wasp, and a bunch of Cabbage whites when I went to Morning Side park.
Cicada killers are a kind of wasp. They mainly use cicadas as their host food for their larvae but I've seen them use katydids and the like.
I think they're beautiful in a fierce predatory kind of way. It was flying around a field I was in. It's obvious what it was looking for. :)