On July 21, 2000, a home invasion in Pico Rivera, California, ended with 17-year-old Richard Angel Flores Jr. and his father Richard Flores Sr. and sibling Matthew Flores stabbed to death while they slept. The family’s home was attacked by two assailants identified as 17-year-old Michael Naranjo and 16-year-old Monica Diaz, an adopted member of the Flores family. Investigators described the scene as extremely brutal; all victims suffered multiple stab wounds. Sylvia Flores survived despite 15 stab wounds and a slashed throat and later described waking to the attack and fighting off an assailant.

Prosecutors said Naranjo and Diaz conspired because they believed Diaz’s adoptive parents were mistreating her. Both attackers were arrested and charged. Naranjo pleaded guilty to the murders and the attempted murder of Sylvia Flores. Diaz was convicted and initially given life without parole; an appeals court later modified her sentence to four consecutive 25-years-to-life terms.

The killings shocked Pico Rivera and prompted memorials for the victims. If anyone knew the Flores family, the attackers, or has information about the events that night, please share what you know.