UltraHD Iray HDRI With DOF - Pines Beach

UltraHD Iray HDRI With DOF - Pines Beach
I set up an indoor scene and used the HDRI image for a background view out of the window. I now need to change that the background, but I can't figure out how to get rid of the image. I've gone so far as to delete every visible item in the scene and the HDRI image still shows up when I render. I've tried checking in the environment settings, but I haven't been successful in fiuguring out wher and how the HDRI image loads into the scene.
I really like the lights and the way the background works, I just need to get rid of it for now.
Any hints?
Comments
If it's Iray the HDR image is in the environment group of Render Settings.
Thanks, I'll give that a look...