A senior al-Qaida militant who was held by the US in secret prisons and once gave information about links between al-Qaida and Iraq that was later deemed false has reportedly died in a prison in Libya, according to a Libyan newspaper and an Islamic activist in London. Human Rights Watch on Tuesday called on Libya to investigate the death of Ali Mohammed Abdel-Aziz al-Fakheri, better known by his nom de guerre Ibn al-Shaykh al-Libi, who was captured in Pakistan in 2001 and was later sent to Egypt under the CIA's extraordinary rendition program, where he was reportedly tortured. The Libyan newspaper Oea reported he committed suicide in prison by hanging himself with bedsheets. The paper, which is close to the son of Libyan leader Moammar Ghadafi, said he died late last week but did not specify the day. There was no official confirmation of his death from Libyan officials or state-run media.