A 21-year-old undertrial lodged in the Ambala Central Jail hanged himself to death from a tree on the jail premises, just a day after he was sent to judicial custody for allegedly abducting a class 11 girl, police said on Wednesday. Gurmeet Singh (21), a resident of Yamunanagar, was arrested recently on the charges of abducting the girl student from Panjokhra village and was sent to judicial custody on Monday. He hanged himself from a tree using his bedsheet Tuesday evening, the police said. They said the jail authorities were informed about the incident by some inmates and they rushed him to the Ambala City civil hospital where he was declared brought dead. Ambala Jail Superintendent Lakhbir Singh said Gurmeet was found missing during the counting of the inmates Tuesday evening.