SHANGHAI, Nov. 2 -- A MAN who stabbed his pregnant wife to death because he believed the baby she was carrying was another man's had his arrest ratified by the Minhang District Prosecutors' Office yesterday.

In a bitter twist a posthumous DNA test proved that the baby was indeed fathered by Yu Lang, the man who stabbed his wife more than 30 times on a warm afternoon in August this year.

The victim was Zeng Yifeng, from Jiangsu Province, and was five months pregnant when she was killed, prosecutors said.

She became pregnant one month after she got to know Yu and soon afterwards they were married.

But Yu was never convinced the baby was his. He tried to persuade her to have an abortion but she refused this again and again.

Yu was taken aback at the way his wife angrily refused his demands that she have an abortion - she had always been gentle and docile up to then. Her sudden change of character made Yu believe that she was keeping a secret.

On August 19 when Yu again told his wife to have an abortion, and she refused, Yu flew into a rage, drew his knife and stabbed her repeatedly first in the stomach and later in the chest.

As the bodies of his wife and child lay bloodied on the floor, Yu became very calm, washed the knife, called his father and sat in his study, smoking. Yu's father arrived and called the police.

Yu's father told prosecutors that his son was introverted and unemployed. He was suspicious that the baby was not his because his wife became pregnant so quickly.

Were it not for Yu's bloody attack, he would now have been the proud father of a baby boy.