On my porch. Every time I got too close, it would fly away and land head down or nearly so. It was always on a bare wall or door, never anywhere with cover (which there's a lot of on my porch) or on a screen. It didn't seem interested in more or less light.

Tachinidae? Only because I see a lot of those and because it looks like a cousin of this tachinid in my yard. I'm hoping that with closer views, the present one is more interesting.

I have other shots, such as from the front or rear with the middle of the body in focus. On the other hand, some of the many shots I'm uploading may be frass.