19-year-old dismembers his girlfriend with a steak knife in Colorado then hides her body in a trash bag

FRISCO, CO – A quiet Colorado mountain town has been shaken by a gruesome crime in which a 19-year-old man is accused of killing and dismembering his girlfriend before attempting to conceal her remains beneath their bed.

Luis Antonio Mendez Hernandez faces a range of charges, including three different murder counts and a charge for tampering with a human body, following the death of Griselda Amarilis Lopez-Racancoj. The victim, who leaves behind a child, was discovered after police were summoned to a Frisco residence in the early hours of December 29 for what was initially described as a medical emergency.

When officers arrived that night, their expectations of a routine call quickly morphed into something far more disturbing. Two female residents of the home led them to a bedroom shared by the couple. Hidden in a white trash bag under the bed, police found the dismembered remains of Lopez-Racancoj.

The subsequent investigation uncovered chilling details. According to court documents unsealed this week, one roommate revealed that Lopez-Racancoj had ended her relationship with Hernandez just two days prior, following a heated argument. She noted that she had not seen Lopez-Racancoj since, but observed that Hernandez later appeared with fresh scratches across his neck and chest.

Inside the house, investigators found a bloodied steak knife in Hernandez’s closet, alongside pillows stained in a manner suggesting someone may have been suffocated. Further examination of the scene led detectives to conclude that significant efforts were made to hide evidence and mislead authorities.

As the timeline of events began to take shape, another resident stepped forward with a critical piece of information—unsettling text messages received from Hernandez on December 28. In the messages, Hernandez abruptly asserted that Lopez-Racancoj was suicidal, stirring confusion and alarm among those who knew her.

When questioned by police, Hernandez offered a narrative that differed sharply from forensic findings. He claimed to have discovered Lopez-Racancoj’s body in the middle of the night, saying he was paralyzed by shock and afraid of being held responsible. Instead of calling for help, he admitted to hiding her body and later searching online for disposal methods.

Detectives pressed Hernandez about his injuries and inconsistencies in his story. He reportedly insisted that his scratches were self-inflicted and declined to discuss the wounds found on Lopez-Racancoj. He also attempted to suggest that she may have taken her own life, mentioning harassment from another individual.

Hernandez was taken into custody later that same day, as law enforcement pieced together evidence increasingly inconsistent with the suspect’s account. The probable cause affidavit, which had been sealed until this week, details the extent of the efforts to conceal the death and disguise the facts of the case.

Now being held in Summit County Jail on a $5 million bond, Hernandez awaits his next court appearance. Police and prosecutors continue their investigation, while the community and the family of Lopez-Racancoj grapple with the shocking loss.