hdiutil detach doesn't remove icon from desktop

So, Leroy's suggests using hdiutil eject, but the man page says that that's a synonym for detach, which is what I am using.

"detach a disk image and terminate any associated process. dev_name is a partial /dev node path (e.g. "disk1"). As of Mac OS X 10.4, dev_name can also be a mountpoint. If Disk Arbitration is running, detach will use it to unmount any filesystems and detach the image. If not, detach will attempt to unmount any filesystems and detach the image directly (using the `eject' ioctl). If Disk Arbitration is not running, it may be necessary to unmount the filesystems with umount(8) before detaching the image. eject is a synonym for detach. In common operation, detach is very similar to diskutil(8)'s eject."

Bingo! It also works with dev names, e.g.,

diskutil umount /dev/disk2s2

works.

Thanks!