"DNA testing and analysis has confirmed the identity of Lisa's killer", the district attorney said.
"Through the determined and skilled work of many investigators, we have arrested the person responsible for the heinous acts committed against Lisa and the 25-year-long search for answer is over", Gulluni said.
"We are so grateful for the hard work and determination and faith that all of these investigators had over all these years", said Diane "Dee" Ziegert.
Police gathered evidence from the crime scene at the time of the murder but they were unable to officially identify a suspect until now, reports said.
Ziegert, who was from Agawam, Mass., was working at her night job at a gift shop when she disappeared in April 1992, Fox 25 Boston reported. Her body was found in a nearby wooded area four days later.
A judge entered not-guilty pleas to charges of murder, aggravated rape and kidnapping on behalf of Gary Schara, 48, at his arraignment in Westfield District Court. He was released from the medical facility Monday and is now in the custody of the Connecticut State Police on a fugitive from justice charge as he awaits extradition to MA.
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The next day, a clerk arrived to find the store open, with its lights on, and Lisa's auto parked where it had been the previous evening. The money in the store's cash register as well as the victim's purse and school materials appeared undisturbed.
Over the years, the single-source, male DNA profile developed from evidence in the case repeatedly was run against state, national and worldwide DNA databases, without a match, Gulluni said.
Last Wednesday, state troopers tried to contact Schara, but he wasn't home.
The District Attorney said in the news conference that Schara has confessed to the murder.
Investigators were also given handwritten document in which Schara admitted to the crimes. He also said Schara tried committing suicide before he was arrested Saturday in CT.