Police to announce update in mysterious Delphi double murder

Police to announce update in mysterious Delphi double murder

Police will announce an update in the mysterious Delphi, Indiana, double murder case on Monday.

The press conference is set for 10 a.m.

MORE: Published police interview reveals new details in Delphi double murder investigation

Libby German, 14, and her best friend Abby Williams, 13, were on a hiking trail in rural Delphi when they were killed on Feb. 13, 2017.

PHOTO: A makeshift memorial for Abby Williams and Libby German next to a trail they were hiking the day they disappeared, Feb. 14, 2017, in Delphi, Indiana. (Lindsey Jacobson/ABC News)
PHOTO: A makeshift memorial for Abby Williams and Libby German next to a trail they were hiking the day they disappeared, Feb. 14, 2017, in Delphi, Indiana. (Lindsey Jacobson/ABC News)
PHOTO: Photos of Abby Williams, left, and Libby German, right, at police headquarters in Adelphi, Indiana.  (Lindsey Jacobson/ABC News, FILE)
PHOTO: Photos of Abby Williams, left, and Libby German, right, at police headquarters in Adelphi, Indiana. (Lindsey Jacobson/ABC News, FILE)

MORE: Police speak directly to the unknown Delphi killer: 'Today could be the day -- sleep well'

Police have never named a suspect or released how the girls died.

In 2017, authorities released a grainy image of the suspect, who they say was on the trail the day the girls went missing. In 2019, police released a brief video clip -- footage taken from Libby's phone -- showing a grainy image of the suspect walking on the bridge near where the girls were last seen.

PHOTO: This Feb. 13, 2017, file photo released by the Indiana State Police shows a man walking along the trail system in Delphi, Ind., authorities say is the suspect in the killings of two teenage girls. (Indiana State Police via AP, FILE)
PHOTO: This Feb. 13, 2017, file photo released by the Indiana State Police shows a man walking along the trail system in Delphi, Ind., authorities say is the suspect in the killings of two teenage girls. (Indiana State Police via AP, FILE)

Police also publicized the suspect's voice -- a recording of him saying "guys ... down the hill" -- which was recovered from Libby's phone.

Authorities released a new suspect sketch in 2019 that officials said was based on a witness' recollection of what he or she saw.

PHOTO: Indiana State Police released a new sketch of the suspect in the unsolved murders of two teen girls. (Indiana State Police)
PHOTO: Indiana State Police released a new sketch of the suspect in the unsolved murders of two teen girls. (Indiana State Police)

The head of the Indiana State Police, Doug Carter, gave a direct message to the killer in an interview earlier this year with ABC News: "We know a lot about you ... today could be the day -- sleep well."

Police to announce update in mysterious Delphi double murder originally appeared on abcnews.go.com