Investigators were able to develop a male DNA profile from evidence recovered at the scene, but it hasn't matched anyone included in national and worldwide databases, Hampden County District Attorney Anthony Gulluni said at a Monday press conference.
Ziegert, a teacher's aide at Agawam Middle School, was working her night job at a gift shop when she disappeared on April 15, 1992.
"They never, ever gave up on Lisa".
The case reportedly became a joint investigation with the Agawam police department, the Massachusetts State Police, the state crime lab, and the FBI. She had been sexually assaulted and murdered. Investigators determined she had been raped before being stabbed.
Authorities found Schara at a CT medical facility, where he was taken into custody on a fugitive-of-justice charge.
Her body was found in the woods on Easter Sunday, about four miles from the store. She was reported missing the next day, when the day clerk arrived to find the store open and the lights still on. The money in the store's register and her purse were undisturbed.More news: Cowboys have highest value in National Football League , according to Forbes
The DNA sample had been run against databases in the past, and investigators made a decision to take another look at prior persons of interest who did not appear in existing DNA databases.
Officials announced a match Monday from DNA testing after arresting Schara Saturday on charges of murder, aggravated rape, and kidnapping.
A year ago, prosecutors were able to create a composite sketch of the suspect using a new technology called DNA phototyping.
Investigators then obtained samples of Schara's DNA through search warrants, and they matched the profile taken from Ziegert's body, Gulluni said. State troopers in MA tried to notify Schara about this process last Wednesday, according to Gulluni. It was not immediately clear if he had an attorney.
Investigators were also given handwritten document in which Schara admitted to the crimes. Schara, 48, had fled to CT and attempted to kill himself, Gulluni said.