I came across an article about Patrick Kearney (after his arrest) and one part of it (on the second page) reminded me of Johnnie --
http://news.google.com/newspapers?id=oGlQAAAAIBAJ&sjid=v1kDAAAAIBAJ&pg=1457,2228315
I still think Johnnie may have been a victim of Patrick Kearney. Several years after Johnnie's disappearance, he killed Arturo Ramos Marquez. Like Johnnie, Arturo was Mexican American and from Oxnard. Arturo was 24 years old, a little older than Johnnie. He might have picked Mr. Marquez up in Los Angeles and not Oxnard (on the day he disappeared, Arturo Marquez had met with an attorney in Los Angeles earlier in the day, this sort of messes up my theory). A couple of days after he disappeared, a manilla envelope containing Arturo's car keys and a typed note in Spanish stating that the keys were to Arturo's car showed up via mail to his apartment. Patrick Kearney is fluent in Spanish.
For some reason, after his disappearance, Johnnie's family checked the skid row section of Los Angeles. I wonder if (and its a large IF) he left the party to go to this area to maybe buy something to keep the party going. Patrick Kearney and his friend, David Hill, frequented a bath house near skid row called the Midtowne Spa (to my surprise it is actually still there and still in business). This is how he was eventually caught because John LeMay had told a friend that he had met a friend named Dave at the gym (Midtowne Spa) and he was going to go see him. John LeMay, Patrick Kearney, and David Hill had all signed in multiple times at Midtowne. I wonder if Johnnie had car trouble or another issue while in this part of LA and had the misfortune to meet Kearney there? Probably the sign in sheet for August 27, 1971 is long gone to see if Patrick Kearney went there that night.