Irish actor Morgan will appear in the final three episodes of the new six-part run, his character Anderson working closely with Gillian Anderson's Dsi Stella Gibson.
"I'm delighted to be joining the cast of The Fall for what is going to be an exciting and gripping second series," Morgan said.
"Allan Cubitt has written exceptional material and I feel very privileged to be working with him and the very talented cast."
The Fall was recently nominated for two BAFTA awards - Dornan is in the running for Leading Actor, while the show itself got a nod in the Mini Series category.
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