New mom Tamron Hall surprised Investigation Discovery fans at its annual true-crime convention, IDCon.

“She was not on the schedule,” an insider told us.

Discovery honcho Henry Schleiff joined Hall onstage.

About 550 crime fans filled Center415, with some dressed as body bags or with crime scene tape.

Attendees were treated to self-defense classes and polygraphs, while John and Callahan Walsh of “In Pursuit” gave tips on how not to have your child kidnapped.

Joe Kenda had one woman in tears when he announced “Homicide Hunter” will end.

It all raised $20,000 for the Silver Shield Foundation.

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