Nina Tassler was the third network executive of the week to take the stage at the TCA press tour today, and she shed some light on the departure of Moonlight, the future of Swingtown, and what CSI will look like sans William Petersen. Some highlights:

• To help fill the hole on CSI left by Petersen's departure later this season, Tassler said the producers plan to introduce a new character with "an interesting genetic profile" that is comparable to that found in many serial killers. His character is on something of a journey of self-discovery, she said. But he's not going to be a direct replacement for Petersen's character: "He is an outsider coming into the CSI unit," Tassler said, and he is not (at least immediately) the boss. They're still searching for an actor to play the role.
• As for Moonlight, Tassler reminded reporters that she's not anti-vampire. "Everybody knows I love vampires," she said. "Vampires, witches, werewolves, warlocks — I love them all." But she said that while there was a lot of outcry over the show's cancellation, most of it was passion for star Alex O'Loughlin rather than the show as a whole. She said she'd love to find a place for O'Loughlin on another show in the future.
• Tassler said CBS supports and believes in Swingtown, but she's "a little disappointed in the ratings." As of now, there's no decision made about whether to renew the show or not — though CBS is at least confident enough to have the cast attend tonight's all-star party.

To see what Tassler had to say about Britney Spears and Sarah Chalke on How I Met Your Mother, just read more.

• In response to a question about Britney Spears "saving" HIMYM, Tassler insisted Britney shouldn't get the credit for that. "It was never in danger," she said. "We just took a while to make the announcement."
• As for Sarah Chalke, Tassler said she's confirmed for multiple episodes at the start of the season — but, as of now, Tassler doesn't think she's the mother.
• Will there be more stunt casting? Yes, Tassler said, probably so. She said actors and their agents approach the shows — often as fans — saying they'd like to do a guest spot, and sometimes those work out on screen.

Photo courtesy of CBS