The Tokyo High Court on Wednesday upheld a lower court ruling that sentenced a former Aum Shinrikyo fugitive to life in prison for his role in the doomsday cult's 1995 sarin attacks on the Tokyo subway system that killed 13 people and sickened thousands.

Katsuya Takahashi, 58, was found guilty by the Tokyo District Court in April 2015 of murder and other crimes for his role as a driver for one of the cult members who released the deadly poison on a subway car on March 20, 1995.

Takahashi was also accused of involvement in three other attacks orchestrated by Aum during its heyday in the early 1990s.