Do we know who killed hashirama?

[kisamexRocks]

Edo Tensei is said to revive the user when he was at the height of his power.
So i would say it only revived the third as an old man because that was when he had amassed his greatest knowledge of jutsu.
Madara died a very old man yet was revived as a young man, it doesn't matter how old you are when you die, you are revived at your best.
But to answer your question no it hasn't been explained, but i would say at a guess they will give him some form of Itachi disease related death.
Someone that powerful isn't allowed to be beaten it would break the plot.

Dude, no

Edo Tensei revives the shinobi close to the time of his death. As an example is Nagato, he was revived an old man, crippled and unable to support himself, he was best in his prime as he had red hair and youthful.

3rd was revived in his old age as he died and was sealed in his old age.

Madara died an old man but his Edo was a special summon, proven by Kabuto himself, he died old but due to Kabuto's experiments and Hashirama DNA he was revived past his prime.

it brings you back at the time of your death, but some summons are special.

Hashirama most likely was killed in combat or perhaps disease, Itachi was full of disease yet from Edo Tensei he was ok, so it's plausible he was killed in disease or could be combat.

 

[saltal]

Like i write at other post, he died becouse sealing kyubi on his wife after fighting kyubi+madara. Why.... Check again when you read flash back of kushina ( naruto fighting kurama to take kurama chakra ), or flash back when kurama talk to naruto when kurama say everyone just whan the power of the beast not make friend like Bee, still don't remmember ?? Check again........just don't read from 1 translate...... There is 2 translate.......

That's unlikely, since Mito became a Jinchuuriki before she gave birth (for proof, recall what the 3rd told Kushina before she her delivery). I doubt she'd have sealed the Kyuubi while pregnant, so the 9T defeat and sealing must have happened at least a year before Tsunade's parent was born, and Hashirama lived long enough to teach his granddaughter gambling... So at least 25-30 years after his fight with Madara is my guess.

 

[Moss]

Time

Bullsh*t. In the flashback with Danzo and Hiruzen, we see 2nd Hokage as the 2nd Hokage, and 3rd Hokage is the only one who has retired, so he must've died. Besides, Tobirama still looked young in the flashback.

 

[apple pie of doom]

Probably died shortly after his battle with Madara.
Kakuzu did fight him, but since he did'nt say he killed him I'm pretty sure he did'nt win.