Rose-Marie (a.k.a Rose) was a vampire, servant of Klaus, and the best friend of Trevor. She sired Katherine Pierce, which caused Rose and Trevor to run from Klaus for 500 years due to Trevor helping Katherine escape from him and presumably ending the Petrova bloodline. They kidnapped Elena Gilbert, hoping to turn her over to Klaus for their freedom but Elijah killed Trevor, promising Rose her freedom. She fled after Elijah was staked and supposedly killed.
She later joined forces with the Salvatore brothers to defeat Klaus and had a brief sexual relationship with Damon Salvatore. She was bitten by Jules, a werewolf, and was killed (staked) by Damon, who wanted to end her severe suffering.
Her ghost visited Jeremy in Season 3, revealing she was turned by Mary Porter. She seemed to support Damon and Elena's feelings and wanted them together.
She later joined forces with the Salvatore brothers to defeat Klaus and had a brief sexual relationship with Damon Salvatore. She was bitten by Jules, a werewolf, and was killed (staked) by Damon, who wanted to end her severe suffering.
Her ghost visited Jeremy in Season 3, revealing she was turned by Mary Porter. She seemed to support Damon and Elena's feelings and wanted them together.
