This method was made possible thanks to advances in DNA testing technology and the expansion of genetic databases that have made it accessible to the general public.
In the following murder cases, progress in DNA technology has played a crucial role in tracking down perpetrators and identifying deceased individuals, finally providing answers to grieving families.
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The Golden State Killer was responsible for 13 murders, 60 home invasions, and 50 rapes in Los Angeles during the 1970s and 1980s. Still, he managed to remain undetected for decades.To find the murderer, whose real name is Joseph James DeAngelo, investigators compared onlinegenealogy databaseswith the DNA collected from the crime scenes, just like in the Bear Brook case.In 2018, they found a match, and DeAngelo, a former police officer, was arrested and charged with 13 counts of murder.
Richard Hanchett had heard all types of stories about his biological mother. He knew that she had red hair and blue eyes and that she really enjoyed singing.His mother chose to have him adopted in 1958, right after his birth, entrusting the newborn child to a couple who worked with her at a plant.Richard was always hopeful that he would learn more about his mother, which is why he took a DNA test through Ancestry.com when he became an adult.Later on, Richard got an answer, though it wasn’t what he was expecting to hear.After meeting her family in Tennessee, he was shocked to discover that his mother had been missing since the 1970s.In 2022, FBI investigators using genetic genealogyofficially linkedThe Lady of the Dunes—a previously unidentified woman found dead in the dunes of Provincetown, Massachusetts—to Richard’s mom, whom he learned was called Ruth Marie Terry.Investigators believe that a now-deceased man named Guy Rockwell Muldavin was responsible for the crime.Ms. Terry was thought to have married Muldavin, an antiques dealer, before she was killed. In 1960, the man was arrested in connection with the murders of his former wife and daughter after their mutilated remains were found in their Seattle home.
In 2015, Chelsea Rustad entered a contest and won a DNA “spit kit.” Little did she know that, after uploading her profile to a database, she’d help solve a decades-long cold murder case.Because the woman submitted her DNA, investigators connected her cousin, William Earl Talbott II, to the 1987 double homicide of Jay Cook and Tanya Van Cuylenborg.The Canadian couple was killed while visiting Seattle from British Columbia to collect parts for Jay’s family business.The stored DNA from the crime scene, authorities found, perfectly matched that of Rustad’s 59-year-old cousin.The discovery led to Talbott’s trial and conviction in 2019.“Police told me that without my DNA, he would not have been arrested,” Rustad toldPeople Magazine. Hadn’t she won the spit kit, “there would have been no trial,” and the victims’ families “would have never had answers."
In 1957, a young boy’s body was found inside a cardboard box in the woods of Philadelphia.The victim’s identity remained a mystery for decades, which is why the boy was named “America’s Unknown Child.”Eventually, a court granted investigators access to exhume the child’s body to see if they could locate his family using the genetic genealogy technique.In 2019, investigators were able to identify the boy’s mother and father thanks to a second cousin who had uploaded his DNA to a public database. Two years later, the victim was officially given a name:Joseph Augustus Zarelli, born in 1953.His assassin was never found.
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Dennis Rader was responsible for the murders of at least 10 people across Kansas from 1974 to 1991. Thekillerwas interested in playing a game of “cat and mouse” with the police authorities, sending cryptic letters about his crimes with clues only the perpetrator would know.The revolutionary breakthrough came in 2004, when the serial killer, who called himself the B.T.K. Strangler, sent a floppy disk to the police and dared them to find him.Upon analyzing the clue, investigators discovered metadata on the disk that led to his identity. From there, authorities obtained DNA from Rader’s daughter without her knowledge and found a close match with the DNA obtained from one of the crime scenes.Rader is now serving life in prison.
In 1968, Diane Cusick, a 23-year-old dance instructor, left her class in Long Island during the night to head to the mall for a new pair of shoes.Hours later, the young woman’s parents found her dead in the backseat of a car, her body showing signs of being beaten, raped, and strangled.In 2022, sophisticated DNA testing linkedRichard Cottingham—who had been convicted of or admitted under oath to 11 killings in New Jersey and New York—to the murder.While DNA from Cusick’s crime scene had been tested before, the samples were only matched to Cottingham’s profile in a federal database last year.Anne Donnelly, the Nassau County district attorney,saidthat the breakthrough was possible thanks to technological advances that allow investigators to conduct more thorough DNA tests.“Thankfully,” Donnelly said, “he will spend the rest of his life in prison, where he belongs.”
Lonnie Franklin Jr, also known asThe Grim Sleeper, targeted young Black women who lived in Los Angeles and struggled with drug addiction. After he killed his victims, he dumped their naked bodies in dirty neighborhood alleyways.In May 2016, the serial killer, who stalked LA between 1984 and 2007, was found guilty of murdering nine women and a teenager, though it’s believed there were more victims.The case was ultimately cracked in the late 2000s, after Franklin’s son provided DNA samples following his arrest for carrying a weapon. Investigators found that his DNA closely matched that obtained from the cold case.To confirm the connection, a detective posed as a busboy to collect DNA from a partially eaten slice of pizza that Franklin had left behind.The killer died in his prison cell in March 2020.
While Albert DeSalvo confessed to having killed 13 women in Boston between 1962 and 1964, investigators didn’t believe him, as there was no physical evidence linking him to the crimes.He was still sentenced to life imprisonment for earlier crimes, including sexual offenses and robbery.It wasn’t until 2013 that the Boston Police Department confirmed his confession.DNA technology allowed investigators to link DeSalvo to the last of his victims, 19-year-old Mary Sullivan, who was raped and murdered in 1964. She was the only woman for which DNA evidence (a semen sample) was available.According to Suffolk County District Attorney Dan Conley,investigatorsused a DNA sample from a water bottle belonging to the serial killer’s nephew, which produced a match with a Y chromosome in the semen sample from 1964.The Boston Strangler, who made his way into the homes of trusting single women during the 1960s only to murder them once he was let inside, was stabbed to death in prison in 1973.
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