If you claimed the child on your return, and you were able to e-file the return, no one else will be able to claim that child and e-file.
The non-custodial parent can try to claim the child and mail the return in which case the IRS will investigate, make a decision and most likely charge tax, interest, and possibly a penalty on the person that tried to claim the child and shouldn't have.
If the return involves the Earned Income Tax Credit, that credit may be taken away for up to 10 years.
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