Liberty “Libby” German, 14, and Abigail Williams, 13, were found murdered on the morning of February 13, 2017, after German’s sister dropped the pair off at the entrance of a hiking trail the day prior.

Now, sources are telling FOX 59 Indianapolis that a man named Richard Allen, 50, is in custody in connection with the murders.

“Just know how grateful I am for all of you,” Liberty German’s sister, Kelsi German, said in a Friday afternoon tweet.

“No comments for now, any questions please refer to the Carroll County Prosecutor’s Office. There is tentatively a press conference Monday at 10am. We will say more then. Today is the day.”

She added that “nothing is confirmed at this time”.

Police say German used her cell phone to snap images of a man walking across the railroad bridge shortly before she and Williams were killed on February 13, 2017.

German also recorded the man believed to be the killer ordering the friends “down the hill”.

Despite images and audio of the suspect, the high-profile case has gone unsolved for five years — sparking mountains of online speculation and amateur sleuthing.

Journalist Áine Cain and attorney Kevin Greenlee, who host The Murder Sheet podcast, obtained court documents in May and August indicating possible developments in the case involving two different men.

In May, Cain and Greenlee obtained a search warrant saying authorities searched the property of Ron Logan, near where the girls were found on March 17, 2017.

He died in January and was never named as a suspect.

The killer likely took a souvenir from the crime scene and removed something or took photos to “memorialise the crime scene”, according to documents obtained by The Murder Sheet.

The warrant obtained by the podcast hosts also said Logan also lied about his alibi and instructed a family member to lie to police about his whereabouts.

Then, on August 19, Indiana State Police petitioned the Miami County Circuit Court for custody of an Indiana man name Kegan Kline, 27.

Kline is currently in custody in Miami County for 30 counts of child pornography-related charges dating back to 2016 and 2017.

Kline, who lived near the location where the girls were killed, had been previously linked to the Delphi murders because he was reportedly in contact with German using a fake social media account the night before she was murdered, according to FOX 59.

He allegedly made plans to meet up with her at the bridge where her body was found the next day, but Kline denies that he had anything to do with the girls’ killings.

In December 2021, Indiana State Police said in a Facebook post that they had uncovered a fictitious Instagram account under the username “Anthony_Shots” during their investigation into the murders.

In March, Cain and Greenlee obtained a 2020 transcript of an Indiana State Police interview with Kline that was accidentally posted online indicating that Kline had access to the account, which had been in contact with German.

However, Kline told investigators that he gave the account password to “a lot of people”, according to the document.

According to the transcript, which has since been sealed in the court record, Kline told police he communicated with German on the day she was killed.

The transcript also revealed that Kline searched “how long does DNA last” on his computer and failed a police polygraph.

Authorities are asking anyone who may know something about the Instagram profile or anything about the case to contact law enforcement at abbyandlibbytip@cacoshrf.com.

Fox News’ Louis Casiano contributed to this report

This article originally appeared on Fox News and was reproduced with permission