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If an abbreviation occurs at the end of sentence, is there one period or two? For example,

Caesar was assassinated in 44 B.C.. Brutus killed him.

Should there be one period or two?

This has nothing to do with etc.

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    Periods are heavy-duty punctuation; one period can do two jobs at once. Jun 4, 2015 at 15:03
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    @John: and even three: My teacher said, "Caesar was assassinated in 44 B.C." Jun 4, 2015 at 15:14

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Only one. Chicago manual of style covers this (with various examples). Other style guides will usually agree (they don't on everything). In your case BC is quite often used without punctuation anyway.

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