Can not delete Free Space on iMac 5K: Partition doesn't appear in CS list

I recently tried to install a bootcamp instance of Win 8.1. The install failed for some reason (wasn't clear from the error message). This left me with an unaddressable partition. I erased that partition in Disk Utility but now I am left with a hunk of Free Space that refuses to be deleted or merged with my Macintosh HD partition.

When I try to delete it from the UI nothing happens -- no error nothing. It just sits there. When I do it from the command prompt I get an error saying that operation isn't available.

PLEASE HELP!

Here's the output of the $diskutil cd list command. Note that this is a 1.1 TB drive and the 250GB Free Space partition doesn't show up here: CoreStorage logical volume groups (1 found) | +-- Logical Volume Group B7C59032-4924-48FD-AE6C-6B937F443A5E ========================================================= Name: Macintosh HD Status: Online Size: 842855342080 B (842.9 GB) Free Space: 114688 B (114.7 KB) | +-< Physical Volume 11715AE4-D61A-404B-8B5F-84E03E196A5C | ---------------------------------------------------- | Index: 0 | Disk: disk0s2 | Status: Online | Size: 120988852224 B (121.0 GB) | +-< Physical Volume 93E06B6F-E206-419D-9ED7-16426463BB3E | ---------------------------------------------------- | Index: 1 | Disk: disk1s2 | Status: Online | Size: 721866489856 B (721.9 GB) | +-> Logical Volume Family 294984BD-084E-40FB-8FD2-3B3DE40FA921 ---------------------------------------------------------- Encryption Status: Unlocked Encryption Type: None Conversion Status: NoConversion Conversion Direction: -none- Has Encrypted Extents: No Fully Secure: No Passphrase Required: No | +-> Logical Volume DD3595D9-58B6-4745-8EC9-816F9ABE30E9 --------------------------------------------------- Disk: disk2 Status: Online Size (Total): 836999970816 B (837.0 GB) Conversion Progress: -none- Revertible: No LV Name: Macintosh HD Volume Name: Macintosh HD Content Hint: Apple_HFS

and for comparison the output of $diskutil list:

/dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage 121.0 GB disk0s2 3: Apple_Boot Boot OS X 134.2 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI EFI 209.7 MB disk1s1 2: Apple_CoreStorage 721.9 GB disk1s2 3: Apple_Boot Boot OS X 650.0 MB disk1s3 4: EFI NO NAME 104.9 MB disk1s4 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD *837.0 GB disk2 Logical Volume on disk0s2, disk1s2 DD3595D9-58B6-4745-8EC9-816F9ABE30E9 Unencrypted Fusion Drive

Finally here is a shot of the disk utility UI: