Luis Rios was known as a generous and close friend, a man who had offered financial help to Preston Alton Strong for years. At 35, Luis was also a father figure to the four children of his live-in girlfriend, 29-year-old Adrienne Heredia. Their blended family life in a home on La Mesa Street in Yuma, Arizona, was shattered on June 24, 2005, by the very man Luis had long supported.
The decision to finally stop lending money to Strong proved to be a fatal one, sparking a horrific act of violence that would claim six lives.
That Friday, after several unsuccessful attempts to reach Adrienne by phone, the father of her two youngest children grew worried and went to the residence. He discovered a scene of unimaginable horror. Police were called to the house after reports of gunshots and screaming. In the backyard, they found Luis Rios, still alive but suffering from multiple gunshot wounds; he died from his injuries later at Yuma Regional Medical Center. Inside the home, a dark and silent scene awaited the officers. They discovered the bodies of Adrienne and her four children, who ranged in age from six to 13.
The investigation into what became known as the "La Mesa Street Murders" was extensive, involving over 1,300 interviews and thousands of tips in the following years. The crime scene told a brutal story. Luis and Adrienne's youngest child, a 6-year-old boy, had been shot to death. Adrienne and her three other children had been asphyxiated, with some of the children also bound and strangled. Prosecutors would later say the killings took place over a span of at least six hours. For more than two years, the case remained unsolved, leaving the community in fear and the victims' families desperate for answers.
Investigators had long considered Preston Alton Strong, a man described as a "career con man," a suspect. Strong and Luis had been close friends, but their relationship soured over money. Luis had given Strong thousands of dollars over the years, but about a month before the murders, he told a cousin that he had refused to loan Strong more money and that Strong was upset. The breakthrough in the case came after Strong was arrested for unrelated fraud charges in November 2007. At that time, police publicly named him as a suspect in both the La Mesa Street murders and the separate 2007 killing of a local physician, Dr. Satinder Gill, who was strangled and bludgeoned in his home.
While already in custody, Strong was tried and convicted in 2012 for the murder of Dr. Gill, receiving a sentence of life in prison. It wasn't until the summer of 2014 that he was officially charged with the six murders from 2005. During the months-long trial in 2017, prosecutors presented evidence that included Strong's fingerprints on plastic bags found near the victims and his DNA on the steering wheel of Luis's car. The defense argued the evidence was flimsy, given that Strong had spent a lot of time with the family.
On April 25, 2017, a jury found Preston Alton Strong guilty on six counts of first-degree murder. The motive, prosecutors successfully argued, was money. Following the guilty verdict, the jury sentenced Strong to death for the murders of Luis Rios, Adrienne Heredia, and her four children. Strong's list of convictions was extensive, including seven counts of first-degree murder for the two separate attacks, as well as aggravated assault, armed robbery, burglary, kidnapping, and attempted arson.
Preston Alton Strong remains on death row in Arizona. His appeals, which included claims of juror misconduct, have been rejected, with the Arizona Supreme Court upholding his death sentence as recently as September 2024. The brutal end to Luis Rios's life, a consequence of his generosity being met with betrayal, stands as a chilling chapter in a string of killings that deeply scarred the Yuma community.
