Question

who killed the guru teg bahadur ji

Answer 1

The Guru was summoned to Delhi by Aurangzeb on a pretext, but when he arrived, he was offered, "to abandon his faith, and convert to Islam". Guru Tegh Bahadur refused, and he and his associates were arrested. He was executed on 11 November 1675 in public in Chandni Chowk, Delhi.

Answer 2

well, he was not killed. He was executed because he refused to accept islam under the rule of aurangzeb.