Hi everybody, i am writing in name of a mate from another forum looking for the reason of his death. I hope you can help and understand my basic english 
Well, first of all 3 photos of the body:
The original source is right here (spanish)
Datas:
- Leucistic Axolotl, about a year old.
- Temp: 22-23º celsius
- Diet: frozen bloodworms, frozen small fish "pejerrey" from sweet waters, turtle sticks from Tetra.
- The dead axolotl was living with another young and new Axolotl
Background:
- 3 weeks ago, she (the mate of the forum where i came from) bought a couple of youngs axolotls to keep company to the leucistic one she already had. One of them died from bacterial infection 2 weeks ago. Photo here.
-A week ago she found the leucistic axolotl with half of his body out of water, above the filter. She got afraid and she touched it, the axolotl started to swim scared as it's normal.
She thougt that that started the metamorphosis because the caudal fin was changing, but the rest of his body was normal. Photo here
Then, she put in the aquarium another young axolotl (the brother of the one dead of the bacterial infection). Both Axolotls were living normally until the big one (dead leucistic) began to be more active, swimming a lot and on the surface.
2 days later, this monday, he stopped eating and yesterday finally died.
What do you think? Could be a bacteria infection? methamorphosis failure? anything else?
Thank you so much, i hope you can help me. See you!!
Well, first of all 3 photos of the body:

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
The original source is right here (spanish)
Datas:
- Leucistic Axolotl, about a year old.
- Temp: 22-23º celsius
- Diet: frozen bloodworms, frozen small fish "pejerrey" from sweet waters, turtle sticks from Tetra.
- The dead axolotl was living with another young and new Axolotl
Background:
- 3 weeks ago, she (the mate of the forum where i came from) bought a couple of youngs axolotls to keep company to the leucistic one she already had. One of them died from bacterial infection 2 weeks ago. Photo here.
-A week ago she found the leucistic axolotl with half of his body out of water, above the filter. She got afraid and she touched it, the axolotl started to swim scared as it's normal.
She thougt that that started the metamorphosis because the caudal fin was changing, but the rest of his body was normal. Photo here
Then, she put in the aquarium another young axolotl (the brother of the one dead of the bacterial infection). Both Axolotls were living normally until the big one (dead leucistic) began to be more active, swimming a lot and on the surface.
2 days later, this monday, he stopped eating and yesterday finally died.
What do you think? Could be a bacteria infection? methamorphosis failure? anything else?
Thank you so much, i hope you can help me. See you!!