Japan has sent Malaysia fingerprint data from the murdered Kim Jong-nam, brother of the North Korean leader, to aid its investigation into his death.The fingerprint data was obtained from Kim Jong-nam when the Japanese government detained him back in 2001 at Narita international airport outside Tokyo for trying to enter the country on a false passport. He told Japanese authorities at the time that he wanted to visit Tokyo Disneyland.The information is believed to have helped Malaysian investigators conclusively establish the victim's identity as the 45-year-old brother of the North Korean leader.The disclosure marks the first time that Japan's assistance has come to light in the investigation into the fatal poison attack, which is widely believed to have been orchestrated by North Korea.The United States and other countries are also believed to have been involved in the probe or lent a hand in the protection of family members fearful they might be targeted next by the regime.