It was castor bean, but not necessarily associated with it. There was a heavy aphid infestation on the plant and honeydew was dripping all over the leaves. Ants, flies, beetles and other bugs had a party with the sweet stuff. I believe this fly was drawn to the honeydew too.

Any sunflowers or thistle plants in this same area?

I believe there are thistles growing around. I'll go check this afternoon to be sure. The area is at the edge of the city and the desert. It is a large, organic vegetable garden that includes eggplants, grapes, peppers, squash, tomatoes, castor bean, beans, compost piles, lots of lantana, desert willow, creosote, elm trees, pines, and a bunch of different weeds.

The wing patterning, location, and presence of thistle in the area would suggest this species. This is a male.

See reference here.

I appreciate your time, attention, and expertise. Great help!