After the Zodiac Killer communication, postmarked December 7th 1969, a phone call was received later that night by the host of commercial radio station KTOK in Oklahoma City claiming to be from the Zodiac Killer. KTOK news director Larry Lamotte told the San Francisco Chronicle that a man rang the station and declared that he had to leave California because "it got too hot for me", remarking that the man did an awfully good impression of the man who rang the Jim Dunbar Show on October 22nd 1969. This is the crucial part. On the same day of December 7th 1969, we have a man mailing a letter to the San Francisco Chronicle mocking the call to the Jim Dunbar Show by stating "I just need help", followed a few hours later by a call to an Oklahoma radio station by a man doing an awfully good impression of the man who rang the Jim Dunbar Show on October 22nd 1969. This impressionist caller could possibly be the Zodiac Killer mocking the Jim Dunbar Show, just as he had done in the letter earlier that day - and would do thirteen days later when he thrice pleaded "please help me". There is no way of finding out the full transcript of the phone call to the Oklahoma radio station, but it wouldn't be too far-fetched to believe he mockingly asked for help on this occasion too.
In addition, we have the December 7th 1969 letter stating "I will kill again so expect it any time soon the will be a cop", followed by the December 16th 1969 Fairfield letter listing 38 "cops" as potential victims, and a December 19th 1969 payphone call to Sergeant Robert Rengsdorff of the San Jose Highway Patrol threatening "I am going to kill five of you officers and a family of five between now and Monday". Three threats to kill cops within twelve days of December. Then came the mocking Melvin Belli letter just one day later. Neither of the Fairfield letters were released to the newspapers, making the December 19th 1969 payphone caller just another lucky chap if it wasn't the Zodiac Killer. It is fairly evident that the Zodiac Killer was responsible for many more phone calls than the two he has been accredited with, including a phone call to the Santa Rosa Police Department on October 15th 1969.
The apparent familiarity with the KTOK radio station, by choosing to call one of its hosts over 1,000 miles from the Bay Area, could suggest an affinity to their style of broadcasting. During the 1960s KTOK radio station featured news, sport and adult music, with the 1960 Broadcasting Yearbook describing its content as "toe tapping music (no rock and roll) and all the announcers are adults". That music included such artists as Tony Bennett, The Mills Brothers and Al Martino. This may give an insight into the maturity and age of the Zodiac Killer when the phone call was made on December 7th 1969, in a year when all three sets of eyewitnesses at Presidio Heights described the Zodiac Killer as 40 years or above. Was the Zodiac Killer an avid listener to this radio station, or did he once have roots in Oklahoma?
This message may have inspired the Zodiac Killer to ring the Oakland Police Department on October 22nd 1969 requesting that either Melvin Belli or Francis Lee Bailey, two high profile lawyers at the time, appear on a chat show hosted by Jim Dunbar later that day. The San Francisco Examiner article was published on October 19th 1969 with the assurance of "legal rights" if the Zodiac Killer phoned in - and requested the murderer to "give yourself up". It was reported in a magazine article in August 1971 that after the caller to Oakland Police made contact, the main thrust of the conversation was that the Zodiac Killer wanted to give himself up, but only if he could be represented by a famous lawyer. Approximately six weeks after the Oakland call, a letter mailed on December 7th 1969 to the San Francisco Chronicle (now validated as Zodiac correspondence), mocked the dialogue in the Jim Dunbar Show by opening his communication with "I just need help", but after threatening to kill a cop he stated "I will turn myself in". This was the only time the Zodiac Killer offered to turn himself in, other than the caller to the Oakland Police Department. To the best of my knowledge no newspaper articles immediately subsequent to the Jim Dunbar Show mentioned the Oakland caller offering to turn himself in - and neither did the Jim Dunbar Show hoaxer. This last section will be deleted if fresh information proves otherwise.