Mukherjee went to visit Kashmir in 1953 and observed a hunger strike to protest the law that prohibited Indian citizens from settling within the state and mandating that they carry ID cards. Mukherjee wanted to go to Jammu and Kashmir but, because of the prevailing permit system, he was not given permission. He was arrested on 11 May at Lakhanpur while crossing the border into Kashmir illegally. Although the ID card rule was revoked owing to his efforts, he died as a detainee on 23 June 1953 under claimed mysterious circumstances.