Kat on the set of 'CSI: NY'

It looks like Katharine McPhee has already filmed her guest role on the upcoming episode of CBS' CSI: NY, as made apparent by the photo of her with the hit crime drama show's main star, Gary Sinise. People.com reports the following:

Katharine McPhee guest stars on an upcoming episode of CSI: NY playing – what else – a singer, and PEOPLE has an exclusive sneak peek. The American Idol Season 5 runner-up is pictured alongside the show's star, Gary Sinise, at the Feb. 18 shoot on the CBS Radford Lot in Studio City, Calif. McPhee, 24, takes on the role of a crime victim who resorts to murder as revenge. The episode is set to air in mid-April on CBS. – Marisa Laudadio

Katharine filmed her scenes for the episode on Wed., Feb. 18. Word is she will in fact be the murderer for this episode. Talk about going against the grain!