Charles Sobhraj, 64, and his 20-year-old Nepalese fianc��e, Nihita Biswas, said they are planning to get married if he is freed by Nepal's Supreme Court.
Sobhraj was convicted by a Katmandu district court in 2004 on charges of killing a Canadian tourist in Katmandu in 1975. He was arrested at a luxury Katmandu casino when he returned to Nepal in 2003. He has filed an appeal to the Supreme Court and a decision is expected in the next few days.
"We are planning a future after his release. We know he is going to be released soon. We are going to be married under French law in France," Biswas told reporters in Katmandu on Saturday.
She said their large age gap did not matter. "I am mature enough to decide for myself," she said. "Age does not make a difference."
The Frenchman has in the past admitted killing several Western tourists, and he is believed to have murdered at least 20 people in Afghanistan, India, Thailand, Turkey, Nepal, Iran and Hong Kong during the 1970s.
However, his 2004 conviction in Nepal was the first time he was found guilty in court.
Sobhraj was held for two decades in New Delhi's maximum-security Tihar prison on suspicion of theft, but was deported without charge to France in 1997. He resurfaced in September 2003 in Katmandu.
