On Thursday, South Korean prosecutors asked a judge to consider life-in-prison for the mentally deranged husband who admitted to killing his 20-year-old Vietnamese wife in July, local news website VnExpress reported.
During a hearings in Busan, prosecutors said Jang Do Hyo committed the crime despite receiving treatment for his condition many times. The prosecutors said there's a risk that Jang would repeat the crime.
The 47-year-old stabbed Thach Thi Hoang Ngoc, of Can Tho, to death just eight days after her arrival in the country. They got married early this year via a marriage brokerage firm.
Jang told the police he heard a voice in his head asking him to kill Ngoc during their quarrel.
Since July 2005, he has been treated 57 times for mental illness, but stopped taking medicine after the marriage. Police say Jang was afraid his wife would discover his past problems.
The final verdict will be announced in an upcoming trial.
Following the case, South Korean pledged to make Korean men looking to marry foreign women undergo a cultural education program. Seoul authorities have compensated Ngoc's family US$25,000.
More than one-third of South Korean men, most of them farmers and fishermen, married foreign women last year, according to figures by Korean authorities.
Statistics from the South Korean Consulate General in Ho Chi Minh City show that around 27,500 Vietnamese women had been granted marriage visas by 2008 and around 8,000 such visas were granted in 2009 alone. This means around 35,500 Vietnamese women had migrated to South Korea for marriage by the end of 2009.
Most of these marriages were conducted by illegal brokerage firms.
Over the last two decades, poverty has driven thousands of women from poor families, especially the Mekong Delta, to marry older men, mainly from South Korea and Taiwan, despite language and cultural barriers.