BETTIAH, Dec. 13 -- A 55-year-old man, arrested on charges of sexually assaulting a mentally-challenged person, died by suicide in a police lock-up in East Champaran district, police said on Friday. Kalyanpur Station House Officer (SHO) Vineet Kumar said the man's body was found hanging from the bars of the Kalyanpur police station lock-up on Friday morning. "He used a noose formed with his lungi to hang himself. The body has been sent for postmortem," he added. The matter came to light after a relative of the deceased visited the police station. The deceased's family alleged police negligence and accused authorities of keeping them in the dark about the incident. Angered by the news, villagers gathered outside the police station. The crowd dispersed only after Chakia SDPO Santosh Kumar and SDM Shivani Subham arrived and assured an inquiry....