
Can I also say "He did away with himself"?

Shouldn't it be with two 't'? I didn't menage to find out if it's a correct spelling or not.
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It looks like "commited" is incorrect, indeed, although it seems to be common enough to deserve its own wiktionary entry:
https://en.wiktionary.org/wiki/commited
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The wiktionary entry cited by @deniko does unambiguously declare that "commited" is nothing but a misspelling. It is therefore always an error, and no dialect of English spells it any other way than "committed."
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I've done it. It will be merged with the existing sentence by Horus
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# This comment was copied from #857853 when duplicate sentences were merged.
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