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(CNN) - In 1991, Denise Sharon Kulb's body was found in a forested dead end and underdeveloped in the suburbs of Philadelphia after she was missing for more than three weeks.
It took 28 years, but the authorities finally arrested someone for his murder, his then boyfriend, thanks, in part, to modern technology and a pair of socks.
Theodore Dill Donahue, 52, was arrested for Kulb's death after police gathered new evidence and conducted new interviews, Philadelphia District Attorney Larry Krasner and Pennsylvania State Police said Tuesday.
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Theodore Dill Donahue was arrested for the murder of his girlfriend in 1991.
Donahue was charged with murder, abuse of a corpse, manipulation of evidence, obstruction of justice and giving false reports to the police. He has pleaded not guilty.
Authorities began investigating Kulb's murder again in 2015, using new investigative tools to reconstruct the case, Krasner said.
One of the methods used was photographic enhancement technology that linked a yellow sock found at the crime scene with a similar sock found in the Donahue department in 1991. After this analysis, the researchers determined that they were a pair of socks to game, said Anthony Voci, supervisor of the Homicide Unit of the District Attorney's Office.
Kulb, 27, was found dead in November 1991 in an undeveloped part of Delaware County, Pennsylvania. His body was broken and covered only with a sweater, while the rest of his clothes were stacked on top of it, according to the district attorney.
"Twenty-eight years ago, Denise Sharon Kulb was found dead in a remote area in the suburbs, abandoned," Krasner said. “She was a mother, daughter, sister, friend. She deserved better than being killed and abandoned in a place unknown to those who cried. ”
"We are determined to help give a closure and some peace of mind to those who have waited for a resolution of this criminal investigation for almost 30 years," he added.
Donahue appeared in court Wednesday morning for a reading of charges and pleaded not guilty, said his lawyer, R. Emmett Madden. He is being held without bail.
"He is innocent and we hope to prove his innocence in court," Madden said.
Investigators say that when they originally interviewed Donahue, he said that the last time he saw Kulb was during a drug-related incident. Donahue told them that he and Kulb had bought and ingested crack before being stolen at knife point. Kulb ran for help and never saw her again, he said.
But when she was interviewed again in 2015, Donahue offered a different version, which she had seen in a bar, and admitted that she had lied before, authorities said. Kulb's sister also said that on the day of Kulb's disappearance, on October 19, 1991, she had seen the couple fighting in front of a bar where her sister worked, according to the district attorney.
In the last four years, Pennsylvania state police said he had conducted multiple interviews with Donahue and other potential witnesses who suggested the man could have participated in the murder. Voci, the prosecutor, said that, in the past 28 years, Donahue told several people that Kulb was killed in his apartment, which ultimately helped his arrest.
"We have never finished investigating any case, as I like to tell people," said Voci.
The interviews "also recreated Donahue's account of how his former girlfriend was found face down in the forest, strangled to death, revealing details that no one but an eyewitness to the crime scene or the author should have known," he says the district attorney’s statement.
Police also said that during interviews in 1991, Donahue acknowledged that his nickname was "Ted Bundy."
CNN has contacted Kulb's family for comment.
Unresolved Cases