Author Note: This story is a Chicago PD/ Criminal Minds crossover. There is a serial killer on the loose in Chicago the resembles the Reaper case the BAU worked 10 years ago. In this story Hotch and Morgan never left the BAU. Erin still left Chicago at the end of season 4. If people are interested in this story I will start updating after I finish Back Where I Belong, which only has about 5 or 6 chapters left.

Disclaimer: I don't own any of the characters on Chicago PD or Criminal Minds. This is an A/U story some things will be kept the same some will be different.

Prologue

It was cold Chicago night. The young couple were making their way home from a friends house. All of a sudden the car hit a pot hole in the road. The wheel on the car began making a weird noise so the young man pulls the car over to see what happened.

"You have got to be kidding me!" The young man said as he slammed his hand against the steering wheel as he pulls off to the side of the isolated road.

"Calm down, Michael. It sounds like we've got a flat. " She says.

He rolls down his window and sticks his head out. He looks at the front tire and sees that it still has air, he glances to the back and sees the tire looks flat. He gets out of the car to check the tire to make sure. He sees that the tire his flat and he as he walks toward the truck, he stops and leans in the window and says, "We've definitely got a flat. I'm going to check the back to see if we have a spare.

"Ugh..Just hurry up and change I don't want to be stuck on this road all night." She says as she pulls out her phone and calls her friend.

He rolls his eyes, "I know Sarah. I don't want to be out her all night either." He shakes his head and goes to the back of the car and gets the spare out along with the wrench. He gets to work trying to change the tire. He sees a van approaching with its headlights on. He raises his arm to shield the light. A man gets out the van and shuts the door. He appears to be talking to someone inside the van before he heads over to the young man.

"You alright?" He says in gruff voice.

"Yeah. We just got a flat nothing serious." Michael replies.

"Do you need any help?" The man asks.

Michael looks up at the man and says. "I think we're good."

"Hey man, if you don't want any help that's your choice. I just want to see if you needed help to get out here faster." The man says as heads back to his car.

Michael sighs and says, "You know what I would love the help. It's been a while since I changed a tire and my girl and I just want to get home." He glances back at the man. Who's was now standing at his opened van door.

Michael turns his attention back to trying to remove the lug nuts. "I hope you're better at removing these than I am." Michael says.

Michael looks up at man and notices he has a mask covering his face. Before he can say anything the man reaches up and hits him over the head with a tire iron.

He moves to the passenger side of the car and pulls out a gun and points it at the young woman's head. She lets out a scream at the gun being pointed at her head. "Give me your watch." He yells.

She removes it and gives it to him. "Please don't kill me." She cries.

He takes the watch from he. "I'm not going to kill you." He says as he puts the gun away. He pulls out a knife instead and she lets out a scream before he slits her throat. He moves back to where he left the young man with his gun out.

Michael regains consciousness and looks up at the man. "Sarah." He calls out.

The man replies, "She's dead."

Michael tries to get up but can't. The man moves closer to him and says, "Are you scared?" Before the young man can reply the man says, "You should be." And he pulls the trigger.

Voight look down at the crime scene photos of the latest murder of a young couple. This had been the third murder in Chicago with the same mo. Leaned back in his chair clearly frustrated. It had been five days with no leads on any of the murders. The Intelligence Unit had been no sleep for the last couple of days and they were still nowhere. The victims were all different ages but the offender left the same symbol at all three crime scenes. Voight knew that he was in way over his head that's why he placed a call the BAU. They specialized in cases like this as much as it pained Voight to bring in the FBI he knew this was the right move. His team was exhausted and they needed fresh eyes.

Voight gets up from his desk and heads toward his closed office door. He opens it up and says, "Go home. Be back early tomorrow."

The unit nods their heads at him and they begin to gather their stuff to leave the district. Voight heads back to his office and sits down at his desk. He leans back in the seat and runs his head over his face. His office phone ringing pulls him out of his thoughts.

"Voight." He answer in a raspy voice.

He hears a heavy voice breathing before they speak. "I'll stop killing them, if you stop hunting me."

Voight is up of his chair in a instant. "You son of a bitch. You think you can come into my city and tell me how do things! There is no hole you can hide in that will keep me from finding you!" Voight yells as he slams the phone down.

Let me know what you think or whether not I should continue with this story.