Facts: - death date: 5 april 2007 - birth date: 23 september 1939 - name: kaneyoshi kuwata - birth place: osaka , japan Based on these bullet points, write a short biography describing the life of kaneyoshi kuwata .
in 1969 , kuwata was active in the yamaguchi-gumi .in 1989 , he climbed up to yoshinori watanabe 's personal secretary , which within a year , he was promoted up to the head assistant .kuwata was involved in a december 1997 assassination in tokyo .tokyo police found a handgun which had been dropped by one of kuwata 's subordinates after a drive-by shooting .he was charged with weapons possession in 1998 , and was sentenced to 7 years in prison by the tokyo district court .his appeal was rejected by the tokyo high court and then the japanese supreme court in may 2003 .during his time in jail , kunio inoue adopted his child in 2004 in 2005 , the '' kumicho '' status of yamaken-gumi was transferred to kunio inoue when kuwata sufficiently retired .during his time in hachiiozi medical prison , kuwata 's liver disease deteriorated vastly and the tokyo public prosecutor 's office ended his prison term on march 15 , 2007 .three weeks later , on april 5 , 2007 in his home in osaka , he died at the age of 67 .