DELPHI - The families of Libby and Abby continue to pray for justice as the manhunt for their killer continues four years after their death.
Liberty German's grandparents, Becky and Mike Patty say they were asked to write an open letter. The couple shared that letter with WRTV which includes a plea to the public for just "one minute" of their day to help bring this case to a close.
"He killed once and could do it again," the couple wrote. "We realize there are many unsolved murders out there, so maybe in taking that minute you could help solve this or another case or prevent another horrible tragedy, so another family doesn't live this nightmare in which there is no waking up from. Isn't that worth a minute out of your day?
Libby and her friend Abigail Williams were found dead on February 14, 2017, not far from the Old Monon High Bridge.
Since that day, sketches of the main suspect in their murder have been shared around the country and the world. Investigators say they have had many leads, but there has never been an arrest in the case.
Even four years later, the families of Libby and Abby say they remain confident in the work of law enforcement and that the killer will someday be brought to justice.
Read the full letter from Mike & Becky Patty below.
"Abby and Libby were two friends going out to enjoy a nice day on the trails only to never come home again. This was four years ago and the predator that did this has never been caught.
We were asked if we could write a letter to the public for help and what would we say. Well, this is it.
We're asking the public to give us a minute. When asked to do something Libby would always say "give me a minute." Now we're asking you for that minute.
When you are out doing your normal daily life activities, sitting in a restaurant, standing in line at a store, or sitting in the bleachers at an event. Strike up a conversation with whomever is close to you. Bring up the story of Abby and Libby, it may be someone who has never heard about our case, this will help raise awareness. Share the flyer on your Facebook, Twitter, Instagram account, or whatever social media platform you use. I know it is asking a lot, but keep the sketch, tip line, and flyer in your phone for quick reference. If you know someone that may have been in or lived in Indiana four years ago -- ask them to think back. Do they know anyone that started acting different around that time? Someone knows this person, maybe you will reach the person that can identify him.
The investigative team stated they only need one piece of the puzzle, maybe you or someone you meet unknowingly has that piece. Possibly, by bringing up our case will spark something within someone. I know four years is a long time, but we must have hope that someone has the key to unlock this puzzle.
Realizing life goes on, life is busy, people forget. Please understand, at one time that was us also. But not now, we are stuck in time looking for a monster that murdered two young girls. We are only asking for one minute out of your day. If it was your child or loved one, would you think that is too much to ask?
He killed once and could do it again. We realize there are many unsolved murders out there, so maybe in taking that minute you could help solve this or another case or prevent another horrible tragedy, so another family doesn't live this nightmare in which there is no waking up from. Isn't that worth a minute out of your day?
We need and appreciate everyone's help in bringing this to resolution.
Thank you –
Mike and Becky Patty"
If you have information about the case, please contact the FBI: