On the night of 3 February 2021, during the lockdown, Lokman was returning alone in his rented car to Beirut, after visiting a friend in the village of Niha, Tyre District, and was not traceable in the next hours. Later, Slim's car was discovered in a remote area between the villages of Addousiyeh and Tafahta in southern al Zahrani district, Sidon District, where he was found shot to death in his car in southern Lebanon on the next day of morning. He was 58 years old.