Background
Angela was a nice girl whose father was a college professor , She lived with her roommate Lindsey . She was dating Matt Harrson but she walked in on him sleeping with Lindsey. So she went over to her close friend Neil's house but Matt went to talk to her. She snuck out and when she was driving home, talking with Matt, her car went off the road and crashed, killing her instantly.
Neil brought her back from the dead due his crush on Angela. After she was resurrected, Angela had been staying in Neil's basement. Unfortunately, Angela didn't come back as Angela. She had become twisted. So she killed Matt for cheating on her and tried to kill Lindsey, but was stopped by the Winchesters.
After Sam and Dean stopped her, she went to Neil's office at the school and overheard Sam and Dean's "plan" to kill her. Back home, Neil asked her why she was out of the house, she avoided the questions and asked him to stop the boys from killing her. When she realized Neil wasn't going to help her, she snapped Neil's neck. Then she headed to the cemetery where the Winchesters lured her to her grave. Sam and Dean managed to get Angela back into her grave and stake her. During the struggle with her, Sam broke his hand.