Authorities say the composite is a result of numerous tips and shows a man with reddish brown hair, between 5 feet 6 inches tall and 5 feet 10 inches tall and weighing between 180 and 220 pounds, WISH TV reported. State police ask that people focus on the man's facial features.
Anyone with information is asked to call the established tip line at 844-459-5786 and can remain anonymous.
There's a reward in excess of $230,000 for information that leads to the arrest and conviction of the person, or persons, responsible for the murders.
Earlier, police released a grainy image of a suspect and an audio recording of man saying, "Down the hill".
Mike Patty, Libby's grandfather, said, "Please spread the information", when he heard about the sketch being released. Their bodies were found near the Delphi Historic Trails on February 14.
"We feel this is very important because it actually gives a better view of the person in the picture that you see down below", Sergeant Kim Riley said at a press conference, Fox 59 reports.
State police say they will release new evidence on the main suspect in the killing of two northern in girls in February.
"We've always felt like we are going to solve this", he added. This evidence was captured by German's cellphone about the time of her death, police said.
State police say they will release a composite sketch of a man considered the main suspect in the killings of two northern in girls.