A lady doctor working in the Air Force Command Hospital has allegedly committed suicide by hanging at her official quarters on Monday.The doctor identified as Shobha (31), a spinster, has not left any suicide note, Deputy Commissioner (East) Muniswamy said.The doctor's parents, who came to know about the incident only yesterday, told the police that they did not suspect any foul play.Since the doctor bolted her house from inside before ending her life, no foul play was suspected, Muniswamy said.