Reileen Kawahara was the sister of Takeshi Kovacs. Originally believed to have died in 2130, Relieen was revealed to have survived and became one of the most powerful meths to ever exist. She was later killed by Takeshi Kovacs in an effort to end her reign of terror.
Under the alias of Gena, she was a CTAC detective who tried to capture The Yakuza's tattoo artist Holly Togram for her investigation. Reileen was interrupted by Takeshi Kovacs who was under the alias of Ken. When they were attacked by Tech Ninjas, Ken, Holly, Gena and several CTAC soldiers had to work together.
(Source: altered-carbon.fandom.com)
