How do I remove a "created" case sensitive disk image?

Thanks for taking the time to read this, and thanks in advance for any and all advice. =)
I used this command in an effort to ready my machine for android sdk and kernel editing (more exploratory and self education than actual editing). I want to understand and learn more the linux environment, but have decided ubuntu would be a better way to do this. I have a relatively small SSD and need this 40gb back to dual boot.
hdiutil create -type SPARSE -fs 'Case-sensitive Journaled HFS+' -size 40g ~/android.dmg
Unfortunately, I have already proven I'm not worthy of such adventure as I can not seem to figure out how to remove the 40gb dmg and free the space.
I can eject, erase and move to trash but the 40gb just doesn't come free.
Thanks!!

Problem solved. Unmount, move to trash. Moderator please remove.

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How do I remove a "created" case sensitive disk image?

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