UPDATE:

MAJOR ROLES
Detective Coltstein- Mark Hyder
Apple Bloom:- Twidash FTW
Scootaloo- Aquee
Sweetie Belle- Split Insanity
Diamond Tiara- Crystallynne
Silver Spoon- Crystallynne
Nurse Daisy- Twidash FTW
Zecora- OPEN
Applejack- OPEN
Granny Smith- OPEN
Annie- KurroSan -MTT Brand Sinner
Religious Pony- Sparrow 9642

MINOR ROLES

Coffee Shop Cashier (female) - OPEN
Librarian (female) - OPEN
Cadwell (male)- OPEN
Sheriff Hoofman- OPEN
Lyra (pony that helps Coltstein)- OPEN
Bon Bon- (other pony that helps Coltstein)- OPEN

Additional characters more than likely will be added as the story goes on. If you are able to voice any of the open roles, plz comment and send me a voice sample to my gmail which is linked to my youtube account. Please note that some of the Mane 6 have been excluded, because some don't fit the story. Best of luck, even if you are a minor role :)

Link to the story (still incomplete): http://www.fimfiction.net/story/325788/unmarked

After a series of horrific events, Apple Bloom, now locked up in a psycho ward hospital, must deal with the consequences of her actions, while revealing the full truth of what happened over a period of three months, and what led her to killing her friends and taking the cutie marks of other ponies.