The sound of hoofsteps filled the air as the pony ran for her life. Her pink coat soaking from all the rain. Her heart stopped when she heard a chilling voice say:

"you can run but you can't hide. I Will find you and put you in a grave!"

Diamond Tiara ignored the voice and kept on running, praying she doesn't get caught. All of a sudden, she felt herself fall forward as she tumbled into a ditch. Normally Diamond would shriek at all the mud that was covering her body, that gave her an idea. Slightly grimacing she started to smear mud all over her body hoping that she would blend into the muddy, forest floor. Closing her eyes, she held her breath as the sound of hoofsteps got closer and closer.

Then she heard it, a creepy, clown-like giggle "He he he, oh Diamond that is pathetic although you did surprise me. I never expected you to cover yourself in mud. You must be desperate".

Suddenly Diamond Tiara screamed in pain as a gleaming, shiny scalpel pierced the flesh around her cutie mark. "PLEASE STOP, I'm sorry, I'm sorry for bullying you, please don't kill me" Diamond screamed tears blurring her eyes as her cutie mark was ripped away from her flank causing blood to ooze out of the now gaping wound.

"Hmm let me think about that" Scootaloo said as she lifted her bloody hoof up to chin as if she was stroking a beard. Then she grinned before cruelly saying "naah. This is way more funner but anyway at least you will now know how it feels to be an adult blank flank". Laughing maniacally, she grabbed a long, sharp knife from her saddlebags and started to repeatedly stab diamond in the face. Blood splattering her face while her laughs and Diamonds screams filled the forest air.

Diamond Tiara was barely clinging onto life. Her face was covered in slashes. She tried to get up and run away but Scootaloo retrieved a hammer from her saddlebags of horrors and tutted "tut tut tut, how rude of you for trying to get away from a pony trying to do her job. Why don't you make it easy for me by staying still?" Scootaloo asked crazily, right before she slammed the hammer onto Diamond's hind legs which caused both Diamond to scream in pain and for the leg to elicit a sickening crack. Diamond Tiara could now only crawl as the deranged mare told her victim" If you want me to stop then beg, beg and ill stop hurting you"

"ple-" Diamond tried to say but was cut of from Scootaloo.

"NO, get on your hooves and knees and beg!" ordered Scootaloo.

Grunting in pain Diamond Tiara managed to crawl onto knees, trying to hold back screams, her leg felt like it was on fire. She then looked up at the sychopathic killer and pleaded "Please stop. I won't tell anypony. Please I'm sorry, I don't want to die"

"Well considering you said please and I know for definate that you're not going to tell anypony. I'll stop" Scootaloo said with a smile before slashing Diamond's throat, the blood spraying onto Scootaloo's face as she watched Diamond clawing at her neck before falling to the ground lifeless. "There I stopped. That felt exhilarating" Scootaloo added before laughing like a lunatic. She then proceeded to cut of the other cutie Mark before sticking it inside of a scrapbook she then took out a Polaroid camera and took a picture of the corpse, sticking the picture next to the Cutie marks. She then wrote what appeared to be a note and scrunched it into a ball which she then placed into Diamond's mouth. Grinning she then left scene of the crime.

***

Void Streak was sitting in a coffee shop, having a cup of coffee, he grimaced at the taste. He was more of a tea pony but when you was in his line of work it was always hoofy to have cup of coffee. Void Streak was a special agent with the Royal Investigation Service which was an elite group of detectives and criminologist whose main aims were solving the most heinest of crimes. Void specifically worked in the serial crimes unit which was a group of detectives and profilers dedicated to hunting down serial killers. Void Streak was a blue pegasus with a blue and white mane and tail and a shooting star for a cutie mark. He was about to head to work when he overheard a newsreport on the TV. "We are now live here in the small town of Ponyville where authorities have found the mutilated body of a young mare. Local police chief Shield Badge issued a statement saying that they found the body in a ditch in the nearby Everfree Forest, which is famous for being one of the most dangerous forests in Equestria. He also added that the Ponyville Police Department was treating this as a homicide investigation. We will continue to go back to this story when we have more information ".

Void frowned at the TV. Local cops must be overreacting, it was probably a timber wolf that killed that young mare he thought while rolling his golden, yellow eyes.

***

When Void Streak entered the RIS headquarters he made his way up to the 3rd floor where the serial crimes unit was based. As soon as he entered the office floor, one of his partners and their tech analyst Circuit Board said "Hey Void we need to head to the round table, we have a case". The round table was RIS slang for meeting room, this was where they were briefed on different cases.

My Unit Chief and boss, Senior Special Agent Chain Link announced "Earlier this morning the body of a young mare was discovered in the Everfree Forest. The victim was identified as Diamond Tiara who is the daughter of wealthy bussiness stallion Filthy Rich. She was found with multiple stab wounds to the face, her right leg was broken and most peculiar of all her cutie mark, which was a litual diamond tiara, appears to have been cut of and removed".

Looking up at the crime scene photos of the body I could see what appeared to be a white ball of some kind. Putting my hoof up I asked "How are we sure this wasn't misadventure or an animal attack and what is that in her mouth?"

Chain replied with "The answer to both of those questions is that this thing inside of her mouth is a crumpled up note which is written in the victims blood sais Hello if you are reading this then that means you have found my first victim. You are probably wondering why I killed her? I killed her because, one she was a little bitch who loved looking in the mirror and two, she has that monstrosity on her flank. You are also probably wondering who am I? Well you can call me the Cutie Mark Ripper

I immediately start thinking of a profile for this killer. "Well because this Unsub already gave themselves a name, I would say they are narcissistic and the fact that they wrote a note tells me that are also craving attention and because the killer reffered to the Cutie Mark as a 'monstrosity' suggests that they have something against cutie marks as a whole. All in all I'd say this Killer isn't finished killing" Void Streak says like he was reading of a list.

"Agreed, that is why we are heading straight to Ponyville" Chain says.

Yay I think sarcastically I have to hope I don't run into some 'old friends'...

Author's Note

Royal Investigation Service is what I think the Equestrian equivalent of the FBI is

I will also be adding modern day items such as electronics and phones as well as gun's.