Newsday/Don Thompson, Gillian Flaccus
Franc Cano, 27, and Steven Dean Gordon, 45, both registered sex offenders, were both wearingankle bracelets when they raped and killed at least four women.  The discovery of one woman'sbody, Jarrae Nykkole Estepp, 21, on a conveyor belt at an Anaheim trash-sorting plant last monthwas the key to breaking the case.  Authorities were confident that there was at least a fifthvictim and perhaps more.  Each man was charged with four felony counts of specialcircumstances murder and four felony counts of rape.  The disappearances in Santa Ana of thethree other women are being treated as homicides, although their bodies have not been found. Kianna Jackson, 20, was last reported seen on October 6; Josephine Vargas, 34, on October 24; andMartha Anaya, 28, on November 12.  In neighboring Anaheim, police Tuesday asked for publichelp to identify a potential fifth victim, a tattooed woman in her early 20s who went missing inFebruary.  Both men had been convicted of sex crimes involving children, Gordon in 1992 andCano in 2007.  Each man had checked in with police every 30 days, as required, and authoritieshad no reason to watch them more closely, Anaheim Police Department spokesman Lt. Bob Dunn said.
The pair had cut the devices form their ankles in 2012, hopped a Greyhound bus fromCalifornia, and holed up in a Las Vegas casino hotel until they were captured two weekslater.  Released again, they were outfitted with new monitors and went on to rape and kill thefour, and possibly five, women before they were arrested last week.  Investigators said datafrom the GPS did help them link Cano and Gordon to the killings, and they were chargedMonday.