Can anyone tell what really happened in Walter Bishop's lab in Fringe that lead to the hospitalization of Walter in a mental institution?

Note: I have watched whole series.


I believe we never found out much more than that there was a freak fire in his lab that killed a lab assistant (Carla Warren). Walter was initially arrested and charged with manslaughter, but was deemed mentally unfit to stand trial, so he was institutionalized at St. Claire's Hospital in 1991.

However, in the fifth season episode "Black Blotter" (in the new timeline), when Walter takes a dose of LSD to try and remember details about their plan, he hallucinates Carla Warren and this vision of Carla claims that she died in a lab fire in trying to destroy his notebook containing many of his ideas, including the original design for the device to cross between universes.

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