AN IDENTITY DISCLOSED IN TWO LETTERS

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It is clear that the Zodiac Killer knew he gave us insufficient clues to reasonably solve the Z32 cipher on June 26th 1970, so a month later, on July 26th 1970, he gave us some additional clues such as "P.S. The Mt. Diablo code concerns Radians + # inches along the radians". This provided us with the following answer. So where are the supplemental clues to the Z13 cipher mailed on April 20th 1970? There are hundreds (probably thousands) of possible unverifiable answers to the Z13 using substitution methods, which the Zodiac must have known to be the case. Therefore, one could conclude that this wasn't the method he chose to use. We had to find a later communication that contained the solution to the Z13 that can be simply demonstrated. The identity in this later communication may also be preceded by "My name is". The following is nothing new, but I just wanted to present the findings in a different format.

When we look at the Exorcist letter mailed on January 29th 1974, the Zodiac Killer appears to add the "Tit-Willow" verse from "The Mikado" for no apparent reason. However, the verse was preceded by "Signed, yours truley;" This may suggest that his identity is within the verse. This concept gained little traction until I looked up the following line in the complete song. The Zodiac Killer plagiarised the section below (in red) to place into his letter. The next line in the below verse (in blue) reads in part "Now I feel just as sure as I'm sure that my name Is". In other words, the Zodiac Killer introduced his Tit-Willow verse with "Signed, yours truley:", followed by the next line which contained the phrase "my name is", and ended with his identity of "Me". The complete sequence reading 
"Signed, yours truley: My name is Me". 

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The Mikado (1885) is a comic opera in two acts

On a tree by a river a little tom-tit
Sang "Willow, tit willow, tit willow"
And I said to him, "Dicky-bird, why do you sit
Singing 'Willow, tit willow, tit willow'" "
Is it weakness of intellect, birdie?"
I cried "Or a rather tough worm in your little inside"
With a shake of his poor little head, he replied
"Oh, willow, tit willow, tit willow!".

He slapped at his chest, as he sat on that bough
Singing "Willow, tit willow, tit willow"
And a cold perspiration bespangled his brow
Oh, willow, tit willow, tit willow
He sobbed and he sighed and a gurgle he gave*
Then he plunged himself into the billowy wave
And an echo arose from the suicide's grave
"Oh, willow, tit willow, tit willow".

Now I feel just as sure as I'm sure that my name
Isn't Willow, tit willow, tit willow
That 'twas blighted affection that made him exclaim
"Oh, willow, tit willow, tit willow"
And if you remain callous and obdurate,
I Shall perish as he did, and you will know why
Though I probably shall not exclaim as I die
​"Oh, willow, tit willow, tit willow".

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When we use the circled 8's in the Z13 to cycle around the cipher by a right shift of eight, we get an identity of "Me" (see below), just like the signature on the Exorcist letter. ​The Exorcist letter, in order, read "Signed, yours truley: My name is Me". The April 20th letter (with a right shift of 8) would now read "My name is Me". The common phrase "My name is Me" can now be shown as a Zodiac identity through two letters, both of which teased us with his name. But is there anything to indicate that the Zodiac Killer employed a "shift-type" cipher on April 20th 1970? Edgar Allan Poe may have the answer.

MUST READ FOLLOW UP ABOUT THE EDGAR ALLEN POE CONNECTION TO THIS ARTICLE 
​ALSO: CRACKING THE CRACKPROOF AND AN IDENTITY IN THE HALLOWEEN CARD