Police gathered enough evidence against Obara that he was charged in Blackman's death and was also connected to the mysterious death of a young woman from Australia, Carita Ridgway, who died in 1992.
Like Blackman, Ridgway moved to Tokyo when she was 21 and began working at a hostess club. For Ridgway, hostessing allowed her to sightsee and earn extra money to put toward her dream of becoming an actress.
That was until she was dropped at a Tokyo hospital gravely ill by a man calling himself Nishita. He told the doctors that Ridgway had had a violent reaction to bad shellfish, and then left.
When Ridgway's parents arrived in Japan, the family's requests for an investigation into the mysterious Nishita were, they say, ignored by both the Australian Embassy and the Tokyo police.
Ridgway was moved to a second hospital, and her family was told she had suffered liver failure, was in a coma, brain dead and on life support. She was cremated on the day before her 22nd birthday, and her ashes were brought back to Australia.
Whatever peace the family made with her death over time was shattered eight years later when Lucie Blackman's remains were found.
After an arrest was made in the Blackman case, Ridgway's family was told that the so-called Mr. Nishita who had brought Ridgway to the hospital was really Joji Obara, who was being charged with killing Lucie Blackman and was suspected in administering a fatal dose of chloroform to Ridgway.
Among the evidence police found in their search of Obara's homes was a diary note that read, "Carita Ridgway, too much chloroform," and a videotape of Obara raping her.
Fifteen years after Carita Ridgway died and eight years after Lucie Blackman's body was found, their families would hear the verdict on the man charged in the deaths of their daughters. "20/20" delivers the unexpected conclusion for two families seeking justice, as well as another family's continued search for answers. Plus, would Lindsay Hawker's killer be caught?