Update, Apr. 22: Police released new video, audio and a sketch of the suspect during the press conference.

Original story:

Indiana State Police on Monday will explain the "new direction" investigators are pursuing in the hopes of capturing the man who killed Abigail Williams and Liberty German in Delphi.

Superintendent Doug Carter will unveil details during a public news conference at noon Monday at the Canal Center, 1030 North Washington St., Delphi.

Sgt. Kim Riley, a spokesman for the State Police, said Friday that “significant information” will be unveiled Monday. Riley would not give any more details, other than to confirm that no one has been arrested yet in the case.

The bodies of Libby, 14, and Abby, 13, were found Feb. 14, 2017 — a day after they went for a walk in the woods on the Delphi Historic Trails in Carroll County, Indiana.

Delphi double homicide:A timeline of the search for Abby and Libby’s killer

The girls were dropped off near the Monon High Bridge, just east of Delphi, at about 1 p.m. on Feb. 13, 2017. They were supposed to be picked up at the same spot by a family member at around 3 p.m. They were reported missing sometime after 4 p.m. that day.

Searches were conducted that evening and the next morning, before the girls' bodies were discovered about 50 feet from Deer Creek and a half mile east of the bridge.

Investigators have been tight-lipped about many details and have yet to tell the public how the girls were killed.

A day after the bodies were found, police released a grainy photograph of a suspect. A week later they released a short audio clip of the suspect's voice saying "down the hill." The photo and recording were retrieved from Libby's smartphone, police said.

In July 2017, they released a composite sketch of a suspect.

According to an FBI description, the suspect weighs between 180 and 200 pounds, stands between 5 feet, 6 inches tall and 5 feet, 8 inches tall. He was wearing blue jeans, a blue jacket or coat and a hoodie at the time of the killings.

Call IndyStar reporter Vic Ryckaert at 317-444-2701. Follow him on Twitter: @VicRyc.