Edgar County, IL - It's been two years, and the brutal murders of two young men are still a mystery.

State police and the FBI have collected hundreds of leads of who killed Mark Prasse and Ryan Riddell. Investigators believe it was a targeted attack, but they still need more information. Police found both of them shot to death in Prasse's home in rural Edgar County two years ago.

There are two tip lines set up. If you have any information, contact State Police at 278-5004 or the FBI at 522-9675.

Thursday night on StormCenter 17, what police say is the missing piece to the investigation.