According to the provided search results, there are multiple instances of individuals who have committed acts of cannibalism. In Document [1], a Ukrainian man named Sergei Lubenko was reported to have killed his girlfriend and her 10-year-old daughter, dismembered their bodies, and consumed the liver of the young girl. In Document [2], a Japanese man named Kazuyuki Sakawa was mentioned as a cannibal who killed and ate a Dutch girl in France. However, he later became a popular author in Japan. These cases demonstrate the disturbing actions of individuals who engaged in cannibalism.