The letter, dated February 8, was circulated on Twitter by AAP volunteers. The Delhi legislators father, Ram Prakash, said Sehrawat would demand money from him, and if he failed to meet his demand, he would threaten him with a revolver.
"He (Sehrawat) has a revolver which he has on several occasions pointed at me. I request you to help me as he is mentally ill and can be very dangerous at times," he said.
"When he was in Army and had gone to Jabalpur for some course in 2005, he started practising black magic there. During his learning of black magic, he suffered a nervous breakdown and was airlifted to Delhi by his brothers and was treated at VIMHANS hospital," he said in the letter.
Ram Prakash remained unavailable for comments despite several attempts to reach him.