Q: hdiutil detach doesn't remove icon from desktop

I am writing an installer script.  Using hdiutil, I am able to mount the DMG, copy the bits off and then, supposedly, detach the disk.  The detach appears to succeed (paste is from log file capturing output):

08/30/16 21:18:30 APPLY UPDATE: hdiutil detach succeeded

08/30/16 21:18:30 APPLY UPDATE: "disk3" unmounted.

"disk3" ejected.

however, the installer icon is still on the desktop.

Is there a way to get hditutil to remove the icon it put there?

Thanks,

coyot