Okay, after searching through news archives, I found a few strong possibilities. Figured I'd list them here.
· Nancy Feusi: Found by a fisherman in Sutter County in a remote area after disappearing late at night from Sacramento three days earlier. Was partially clothed with clothing strewn around. However, she was stabbed, not strangled, and there is no mention of nonfunctional cutting of her clothing.
http://s1106.photobucket.com/user/truthandsoul/media/signore/nancyFeusi_argus_072573.jpg.html
· Deena Shariese Scott, 26: Stabbed and her throat was slashed on Dec. 1, 1985, similarly to Karen Finch. Lived in Manteca, but spent time in Ceres, where Roger Kibbe was living at the time, the day she disappeared. Went to a bar off of Highway 99 in Stockton, and had a solo-vehicle crash just south of the bar - Kibbe targeted stranded motorists on highways in the area. Her body was found in Manteca, so not across county lines, and no mention of scissor cuts to her clothing, but the locations and similarity of her abduction and murder to those of Stephanie Brown, Charmaine Sabrah and Karen Finch is worth looking into.
https://www.facebook.com/pages/San-...omicideMissing-Persons/107929415935434?ref=mf
· Cora Carillo, 24: Found in Douglas County, where Kibbe often visited his brother, who worked as a homicide detective, in 1981. Strangled with a ligature made from her own clothing, which Kibbe did with his confirmed victim Lora Heedick. Disappeared from Carson City, which is independent, so crossed county lines/jurisdictions. I think this is a really strong possibility, and since Kibbe asked his brother about how people can remove evidence and was the brother of a detective, he likely would not have been considered as a suspect in this case.
http://www.officialcoldcaseinvestig...hp?13908-Information-sought-in-unsolved-cases
http://www.8newsnow.com/story/13992...icides-and-unidentified-missing-persons-cases
In Trace Evidence, two possible Jane Doe cases were mentioned, one in El Dorado County that ended up being Robbin Simpson, and one in Nevada that I can't find anything about.
For what it's worth, police only went back a few years from 1986, mainly checked in Sac, San Joaquin and Ellen Dorado counties, and may have only reviewed strangulation cases (Karen Finch wasn't stabbed until 1987.)
I've found others with similarities to Kibbe's known victims (almost all strangulation victims), but either no body was ever found (Kimberly Stewart), or they didn't fit for other reasons. For example, two women, Penny Coyle and Nina Wilkerson, disappeared from Lodi a few months apart in 1981 and were found in the same place in the Delta just 12 miles from where Kibbe dumped Stephanie Brown's body, clothed like some of Kibbe's victims. However, no cause of death was determined, there was no mention of non-functional cutting to their clothes, and given how close they were to where Stephanie Brown was found, I can't imagine the SJ County detectives did not review their cases at the time.
Some of the Santa Rosa hitchhiker murders seem similar to Kibbe's known victims, but they were linked to other murders that sound nothing like him and don't fit his victim profile, and most did not cross county or jurisdictional lines.
Charlotte Cook was strangled and dumped behind a Ranger Station in Daly City, San Mateo County, the day after testifying in a robbery in Alameda County in 1974. Sounds like a possibility, except Kibbe's victims were mostly dumped in remote areas, and if she testified the day before, it's more likely to be connected to that.
I really feel like he has a lot more victims, though, and with him behind bars for the rest of his life and more pressing homicide cases, I worry that his other victims' families will never have closure.