Well we all know that the anime & manga tells us that Marco is dead and was somehow murdered through foul play during the Battle of Trost Arc. We also know that Annie somehow got involved with his death during the Female TItan Arc when Armin confronted her.
A lot of SnK fans have speculated that the corpse found by Jean was not of Marco's but another charact that looks similar to Marco, also part of the 104th Trainee Squad.
I agree that Marco isn't dead yet but a part of a larger conspiracy in the story that I think the author will reveal in the last 2015 or in 2016. The evidence I am pointing out is Marco's name and its meaning.
Marco means Messenger of the God of War. Now the wiki states that is his name because of the cruel fate that will …
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