Kianna Jackson was 20 when she was murdered on October 6, 2013. She was one of four women killed in a series of abductions and sexual assaults in Santa Ana and Anaheim carried out by Franc Cano and Steven Dean Gordon. Jackson’s body was never recovered.

Detectives linked the killings through DNA and data from GPS-tracking devices the two men were wearing because of prior sex-offender terms. The discovery of Jarrae Nykkole Estepp’s body produced evidence that tied Cano and Gordon to Jackson and the other victims. The case also prompted criticism of probation officials after it emerged the men had socialized in violation of their release conditions.

If anyone knew Kianna’s movements in October 2013 or has information about where her remains might be, please share what you know with the authorities handling the case.