Fifty years ago, she was on her way to try to blow the whistle on nuclear safety. But she never made it.

Nearly 46 years after a double homicide, a fingerprint from a taxi license application has led to a suspect's arrest, officials in western Massachusetts announced.

Nearly 46 years after a double homicide, a fingerprint from a taxi license application has led to a suspect's arrest, officials in western Massachusetts announced.

A 84-year-old man has been arrested for a cold case murder from 50 years ago after he was linked to the case with genetic genealogy, authorities said.

Mary Schlais' suspected killer, 84-year-old Jon Miller, was identified through genetic genealogy, according to authorities.

Suspected 1970s serial killer Bruce Lindahl has now been identified as the culprit in a 1979 cold case murder in Illinois, authorities announced Wednesday.

Suspected 1970s serial killer Bruce Lindahl has now been identified as the culprit in a 1979 cold case murder in Illinois, authorities announced Wednesday.

Genetic genealogy led authorities to charge Dana Shepherd in the 1993 rape and murder of Carmen Van Huss in Indiana.

A man has been arrested in the 1993 rape and murder of a 19-year-old in Indiana after he was linked to the case through genetic genealogy, authorities said.

DNA evidence from a discarded cigarette helped investigators solve the cold case murder of a 33-year-old, over 44 years after it was committed in Washington state.

Ruth Buchanan, 52, was killed when a driver ran a red light on Dec. 29, 1989.

Ruth Buchanan was fatally struck when a driver ran a red light, police said.

Susan Leigh Wolfe, 25, was found dead of a gunshot wound to the head in 1980.

A warrant was issued for a 78-year-old man in connection with a murder committed 44 years ago after genetic genealogy helped investigators identify him as a suspect.

A 1986 cold case murder of a teen has been solved after a DNA match led investigators to a convicted serial killer on death row.

The 1986 slaying of a 19-year-old woman whose body was found dumped in South Pasadena has been linked to a serial killer who was convicted of murdering 12 women in Riverside County.

Police recently reopened the unsolved case from 1987 and used DNA to identify the mother.

A woman linked by DNA has been arrested for the murder of her newborn 37 years after the baby girl was found dead in a dumpster in California, authorities said.

DNA has identified a suspect in the 1996 cold case murder of a 15-year-old girl in Montana.

The Gallatin County sheriff said authorities found a DNA match linking Paul Hutchinson to the 1996 murder of 15-year-old Danielle Houchins.

Warren Luther Alexander, 73, is being held without bail after being charged in the slayings of three women who were strangled to death in 1977 in California, authorities said.

A man already in custody has been arrested in the murders of three young women who were strangled to death in 1977 in California, authorities said.

Albert Lauro Jr., 57, was identified as a suspect of the 1991 murder of a 23-year-old woman in Hawaii.

Thirty-four years after a brother and sister were murdered, a man has been indicted in the slayings when he was linked to the cold case via DNA.

A Georgia man has been indicted in the double stabbing deaths of a brother and sister in 1990 after he was linked to the cold case via DNA, prosecutors said.

A convicted serial rapist has been identified as the suspect in the 1996 double murder of two women in a Virginia national park, federal authorities said.

A suspect has been identified in a double murder from May 1996 in Shenandoah National Park, Virginia.

After years of dead ends and long legal battles, Marlene Warren's son said he feels that he is at peace following the plea deal of the "killer clown" of Wellington.

Massachusetts authorities are searching for a newly identified suspect in two rapes from 1989.

Stephen Paul Gale, 71, is wanted on four counts of aggravated rape, two counts of kidnapping and one count of armed robbery.

“20/20” explores the multi-decade investigation and conviction of William Lewis Reece, who was linked to multiple murders

A Virginia man has been arrested in connection with the cold case murder of a 32-year-old woman in 1986.

Florida authorities said they believe they've recovered the remains of a 16-year-old girl who mysteriously vanished nearly 20 years ago.

A woman has been arrested in the 18-year-old cold case of a newborn baby that was found dead at Phoenix Sky Harbor International Airport.

A new age progression photo has been released of Massachusetts college student Maura Murray to try to prompt new leads on the 20th anniversary of her disappearance.

On an audio recording of a phone call, suspect Duane Davis and his son can be heard discussing what prosecutors allege was a plot to harm their cooperating witnesses.

A father and stepmother have been arrested for the murder of their 5-year-old son who was found dead more than 30 years ago in South Carolina.

Victor Lee Turner and Megan Turner have been charged in the death of their 5-year-old son, Justin Turner.

More than three decades after she was murdered, police and prosecutors in Riverside, California, are hoping the public can help them identify the unknown victim.

State police announced that after more than two decades of investigating they have positively identified the body that was found in Lake Barkley.

The suspected victim of a convicted serial killer on death row has been identified nearly 50 years after his body was found near a California trail, authorities said.

Cathy Sposito, a 23-year-old college student, was brutally murdered while hiking on a trail in central Arizona and authorities have now identified her suspected killer.

Jacob Wetterling was kidnapped at gunpoint a half-mile from his St. Joseph home just after 9 p.m. on Oct. 22, 1989, and was never seen alive again.

A man has been arrested for the murder of a woman who was beaten to death in 1983 in Northern California.

After more than a century of being kept at a Reading, Pennsylvania, funeral home, a corpse that was mummified has been identified, according to the funeral home.

The man, who died of kidney failure in a Reading, Pennsylvania, jail, was accidentally mummified by a mortician in 1895.

The boyfriend of Crystal Rogers, a Kentucky mother of five who vanished in 2015, was arrested in connection with her disappearance, state and federal authorities said.

A Kansas man has been charged in the cold case murders of two women from the 1990s, authorities said.

Gary Davis has been charged in the deaths of two women dating back to 1996 and 1998.

A new “ABC 20/20" builds on original ABC News reporting from when Alissa Turney disappeared in 2001.