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Originally Posted by Don José
Could you also say "it was me who killed him"? Any difference? Less formal or something like that?
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Yes, they are basically equivalent, and they are both variations on "I killed him".
Expanding a basic sentence such as "I killed him" to either "I was the one who killed him" or "It was me who killed him" typically happens in a conversation where the facts are relayed over several sentences. The expanded sentences typically present the new, contrasting or emphasized information (I am responsible) and relate it to previously-known information (someone killed him).