There's a guy called Merle Abrahams who lived in Sandy Shores. He went a bit doolally and started seeing the number 8 everywhere he went and thought it was a message to sacrifice/murder 8 people, the Infinite 8.
He drew suspicion from his neighbours and was driven out of his home when it was set on fire. The burntout shell of his home remains and there are a few photos below.
A neighbour wrote this on Merle's house in an effort to shame him and send him away.
There will be 8.
This is evidence of the start of Merle's descent into madness. He states that there will be 8 bodies/deaths to fulfill his ritual. Notice a few other things here? There is a 5-bar gate at the left hand side near the bottom. A common means of counting. Possibly at this point he had only killed 5 of the 8 he needed/wanted.
Above the writing is a drawn image of what looks like Mt Chiliad. It isn't though. It actually points to where the bodies are being laid to rest, the very northern tip of the gamemap.
In the back room of Merle's house is this message. 8 is just infinity stood up. This is the first link between the number 8 and the Ouroboros, the snake that eats itself, the symbol for infinity. What relevance this has is still to be found but it is likely an escalation of the madness of Merle.
After Merle's house was burnt down he fled and lived in the Dignity Village in the northern part of the island. This can be determined by looking in a tent at the camp. On the back of a bin within the tent is a red 8 in the same handwriting as that seen on the writings below.
He continued his killings and eventually reached the total of 8. He bragged about this number by writing on a rock in the desert.
One is done
Two was fun
Three tried to run
Four called Mom
Fives not alive
Six is nix
Sevens in Heaven
8 won't wait
This macabre poem describes the deaths of his victims. Note that Merle won't write the word eight, he uses the symbol 8. This symbol obviously has great significance for him.
He also states that 8 won't wait, because of the infinitely looping nature of the character.
After the completion of his ritual he is pursued and eventually caught by the police and sent to prison. Before he is sent he manages to write another piece out in the desert.
They want me they can have
But they'll never get my people
Even though I shall leave them sign enough
Where they put me
A chilling message to whoever has followed the clues. Merle knows he is being pursued by the police and will soon be caught. He knows he will go to prison but states he will never give up the location of his victims in a way that can be understood by the police.
Next to this piece of writing is the following addition -
Well we know from his first poem that 8 won't wait. What does this mean? Has 8 stopped waiting now he has completed his ritual?
Merle is sent to prison, but what about a further confession? On the walls in the recreation yard in the prison near cellblock 9A, the writings below can be seen.
Where water meets land and fire once spewed forth
There the Infinite 8 shall stay
Until I return
Accompanying this is a more detailed map showing the northern tip of the game map and the islands to the north of it. It is obvious that Merle hid the bodies at this location and is keeping them here until he is let out, so he can complete his ritual. The surface of the islands have been extensively searched and nothing has been found, no evidence of fire having spewed out from anywhere, no further writings or symbols relating to the number 8.
Diving under the water around the islands reveals a number of bodies (all 8 are shown below, thanks to Tadden for the picture), bound in wrappings and laid to rest at the bottom of the ocean. The Infinity Killer had reached his sadistic goal.
And what became of Merle? Well a newspaper clipping has been found in Sandy Shores that tells us.
Just looking at the date on the newspaper (December 2004) and the date of the disappearances we can see that these events occurred quite some years ago, too,late for us to achieve an answer as to why these killings occurred and why the number 8 held so much significance for him.
One last theory relates to a song especially made for the GTA V soundtrack, a song called 9 Is God by Wavves. Is Merle now that god?
Thanks to all the wonderful contributors in this thread who have banded together to make this compelling story come to life piece by piece!
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