A 17-year-old rape victim of Koharka village was today arrested in a four-month-old murder case.The girl was allegedly raped by her relative Kulwinder Singh, a SAD leader and former sarpanch of Gorkha village. The leader was booked by the police four days ago.Sources said the victim girl was allegedly involved in the murder of her classmate Avtar Singh (17). The girl’s father and brother of Koharka village were also booked. Her family was opposed to her alleged relations with Avtar. In January, they called Avtar to their home and killed him. The girl’s father and brother were arrested, while the former took shelter in the home of her relative Kulwinder Singh.