(1) He killed himself.
(2) He was killed by himself.
Which one is better? If I want to passive 1st sentence is it correct to use 2nd one? If it is possible or not possible.
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He killed himself. [suicide]
He was killed by himself is not accurate really unless you are contrasting it to: He was killed by his friend. Even so, it's really awkward and unnecessary as "He killed himself" is what it means.
However, one does see the idiom: He died by his own hand. for to kill onself.
[not a very happy subject....]
The two sentences would be interpreted to mean different things.
The first states that he committed suicide or that he died as a result of his own actions if not intentionally: eg: He killed himself by drinking to excess.
The second would be understood to mean that he was alone when he was killed - not that he took his own life, as per FumbleFingers comment.