In a devastating new development to an already heartbreaking California murder-suicide, the long-time mistress of Hector Lionel Alfaro has appeared at the door of his only surviving daughter — and handed her a personal letter written by the killer himself, addressed to his lover, in the period leading up to the tragedy.

Hector Lionel Alfaro, 52, is the man responsible for the January 2026 rampage in their Lakewood home. Early that morning, he fatally shot his wife, Roxana Rodriguez, 48, and their 17-year-old daughter Sienna Alfaro in separate bedrooms with gunshot wounds to the upper torso. He then turned the gun on his eldest daughter, Desiree Alfaro, then 19, firing multiple times at her as she awoke to the chaos. Miraculously, Desiree was not hit. Moments later, Alfaro took his own life right in front of her.

The family was shattered. Roxana was remembered by loved ones as a devoted mother, grandmother, sister, aunt, and friend — the heart of the household. Sienna, often called Lilly by friends, was described as a ray of sunshine whose light was cruelly extinguished far too soon. Desiree, the lone survivor, has been left to carry unimaginable trauma: witnessing her father’s violence, losing her mother and younger sister, and grappling with the why behind it all.

Now, months later, the mistress — whose affair with Alfaro had reportedly been a source of deep pain for Roxana — made direct contact with Desiree. Without warning, she delivered an envelope containing a handwritten letter from Hector to her (the mistress). Sources close to the investigation indicate the letter was composed sometime before the murders, possibly as a form of “insurance” or final message, with instructions that it reach his daughter if “anything happened.”

The exact contents remain private, but those aware of it describe passages blending warped affection, excuses, and eerie references to inevitable actions. It has reignited questions: Was the massacre premeditated? Did Alfaro foresee — or even plan — his own end when penning those words to his secret lover?

For Desiree, the delivery felt like a second wound. Already in emotional recovery and supported by family and professionals, receiving this artifact from her father’s hand — written for another woman, not her mother — has been described as profoundly cruel. Relatives question the mistress’s motives: Was it closure, remorse, or something more manipulative?

Authorities are reviewing the letter for any additional insight into motive or timeline, though the case was quickly ruled a murder-suicide. Beyond forensics, the real damage is emotional: a young woman who escaped death must now confront her father’s final thoughts, preserved not for his family, but for the woman on the side.

This single act has extended the family’s suffering far beyond that tragic morning, turning private grief into public nightmare once more. Desiree, the sole voice left from that home, now holds words no child should ever have to read.