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Son says he is “blown away” after DNA solves 1988 stabbing demise of his mom


The San Diego Sheriff’s Division mentioned they’ve solved the 1988 killing of a lady, however the suspect died in an Indiana home fireplace greater than 20 years in the past.   Genealogical DNA testing linked the suspect to Diane Dahn, 29, who was stabbed to demise in her Santee condominium, county sheriff’s investigators mentioned at a information convention Wednesday .

When she failed to indicate up for work on Could 2, 1988, a colleague from the San Diego Transit Corp. went to her house and located her physique in her bed room. Dahn’s son, then 2 years outdated, was wandering within the condominium complicated.

Investigators relied on testing of fingernail scrapings and a hair recovered from Dahn’s fingers, authorities mentioned.

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  Diane Dahn

San Diego Sheriff’s Division


Testing led investigators to Warren Robertson, a tow truck driver who lived in the identical complicated as Dahn. He died in an Indiana home fireplace in 1999 at age 39, authorities mentioned.

“The investigation revealed substantial and convincing proof that Robertson had murdered Diane,” a sheriff’s assertion mentioned.

It wasn’t clear whether or not the 2 knew one another, however each had been identified to be racing fanatics and attended inventory automotive races on the El Cajon Speedway, the assertion mentioned.

In a video assertion, Dahn’s now-grown son, Mark Beyer, mentioned he was “blown away” by how the killing was solved.

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Mark Beyer was solely two years outdated when his mom was killed.

San Diego Sheriff’s Division


“Wanting again among the struggles you undergo is you’re feeling alone due to what you went by means of, you misplaced your mom,” he mentioned. “The solutions that my household acquired is closure and closure is all the things even after a lot time had handed.”

Dahn’s youthful sister, Victoria Dahn-Minter, mentioned she was grateful that investigators had solved the case.

“I did not suppose something was ever going to return of this,” she mentioned on the information convention. “I assumed I actually was going to go to my grave not realizing, in addition to my mom and father.”

It was the fifth cold-case killing solved by means of using genetic family tree testing, sheriff’s officers mentioned.

The testing matches DNA from crime scenes to commercially accessible DNA databases with a view to monitor down doable kin of suspects. A chilly case crew shaped household histories within the type of “timber,” which led detectives to different potential kin of the suspect.

“This course of was so exhaustive, 9 household timber had been constructed with practically 1,300 individuals related to Robertson both by means of blood or marriage,” the sheriff’s workplace mentioned. “This homicide would possible have gone unsolved if not for using investigative genetic family tree.”

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San Diego County Sheriff’s Murder investigators responded to the scene after the demise of Diane Dahn.

San Diego Sheriff’s Division




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