An Giang police have arrested a South Korean man for allegedly stabbing his girlfriend's mother to death on March 25.
Investigators said Lee Sang Jin, 37, broke into the house of Duong Thi Bi, 65, in Hoa Binh Commune in the Mekong Delta province's Cho Moi District at around 10:30 p.m. and stabbed the woman when she was asleep.
Her two children and a nephew, who rushed to the scene upon hearing her cries for help, were also stabbed and injured by Lee, the police said.
They managed to catch the attacker and take Bi to the hospital, but she succumbed to her injuries before arriving there, they added.
Vo Thanh Ngoan, police chief of Hoa Binh Commune, said Lee killed the woman because he thought she disapproved of his affair with her daughter, 23-year-old Ta Thi Sam.
Sam said she had left for South Korea in 2009 after marrying another South Korean.
A year later, she left her husband because of personal conflicts and worked as a small trader to earn money to get home.
During this time, she met Lee and he helped her to return to Vietnam. Lee visited Vietnam often since then and they came to love each other.
However, Sam began avoiding Lee recently because he was a rude and jealous man, she said. Her family also did not agree with the relationship because they found Lee had a wife in South Korea.
According to local police, Lee had carried a liter of petrol with him, intending to set Bi's house on fire, but failed to do so.
Over the last decade, thousands of young Vietnamese women from poor families in the Mekong Delta have been enticed by illegal brokers to marry mostly elderly Taiwanese or South Korean men who find it difficult to find a bride at home.
According to the Ministry of Justice, more than 257,000 Vietnamese, over 80 percent of them women, married foreigners or Vietnamese residing overseas between 1995 and 2010.