Victor Webster

Castle has tapped Victor Webster to play the new boyfriend of Beckett (Stana Katic), a show rep says.

The Charmed vet, 37, will play Josh Davidson and make his first appearance in the fourth episode of the season, according to Entertainment Weekly, which first reported the casting.

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"There's an element of mystery to him," executive producer Andrew Marlowe tells EW. "He's more of a motorcycle guy ... a person that is going to intrigue Castle, because he's going to see a different side of Beckett."

Castle returns on Monday, Sept. 20 at 10/9c on ABC.