San Diego

Decades-Old San Diego Murder Case Reopened: 73-Year-Old Suspect Arrested in 1976 Killing

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Published on April 28, 2025
Decades-Old San Diego Murder Case Reopened: 73-Year-Old Suspect Arrested in 1976 KillingSource: NATO Training Mission-Afghanistan, CC BY-SA 2.0, via Wikimedia Commons

After nearly five decades of silence, a once-forgotten murder case has found its voice again, resonating through the halls of justice in San Diego. 73-year-old Mitchell Hernandez of Chula Vista was taken into custody last Thursday, linked to the 1976 death of Leo Marquina through fresh evidence and decades of persistence by homicide detectives. Hernandez faces charges for an act presumed lost to time but resurrected by the unyielding efforts of law enforcement. His arraignment took place in the afternoon today, reflecting a small but significant step towards closure for those tethered to the tragic history of this case.

It was on a late afternoon in November 1976 when the landscape of Harrison Avenue darkened with the news of a body discovered, later identified as Marquina; the investigation that unfolded laid a path, albeit a winding one, that has led us to today’s reckoning; officers had arrived on that fateful day to a scene marked by violence, thrusting them into a case that would challenge the boundaries of time, and now, after years of dormancy, an arrest suggests not an end, but perhaps a beginning to unwrapping the mystery. According to the San Diego Police Department's press release, the murder that had initially tested the limits of law enforcement’s reach was never forgotten, carried forward by the dedication of those who serve and protect.

Rigorous investigation by the Cold Case Unit of the San Diego County District Attorney's office, alongside homicide detectives, employed a methodical review of the original physical evidence and witness statements, breathing new life into the cold case. They leveraged advancements in forensic technology and the relentless pursuit of answers, eventually piecing together a narrative that implicated Hernandez, many years after Marquina’s death left a haunting void in the community.

As the courtroom awaits the outcomes of justice’s slow turn, the San Diego Police Department continues to seek information that could further illuminate the circumstances of Marquina’s tragic fate. Even from the dim reaches of memory, those with insights into the case are encouraged to contact the San Diego Police Homicide Unit at (619) 531-2293 or submit tips through Crime Stoppers at (888) 580-8477.