"Unfaithful" is a song by Barbadian recording artist, Rihanna, from her second studio album A Girl like Me (2006). Written by American singer Ne-Yo, Mikkel S. Eriksen and Tor Erik Hermansen, the song was originally titled "Murderer" and is about a woman who regrets cheating on her partner. "Unfaithful" is a pop ballad that contains prominent R&B elements, and was inspired by the works of American rock band Evanescence. It was released by Def Jam Recordings on June 20, 2006, as the second single from the album.