SINGAPORE - The couple were trained in Chinese martial arts, which they often used against each other whenever tempers flared.
Their last domestic scuffle took a tragic turn when the wife died.
Lee Show Fui, 34, was jailed on Friday for five years after pleading guilty to one count of culpable homicide not amounting to murder.
He killed his China-born Singaporean wife, Madam Tang Shifang, 37, in their flat at Block 441B, Fernvale Road, in Sengkang on Aug 31, 2011.
Lee, who has been suffering from schizophrenia since 2007, lost his job as an administrative assistant for a nutrition company a week before the fatal incident.
But he did not tell his wife, said Deputy Public Prosecutor (DPP) Eunice Ng. When he overslept on Aug 31, Madam Tang, thinking he would be late for work, pulled his ear to wake him up and scolded him.
When Lee played a computer game instead, she slapped him on the right cheek, causing him to lose the game.
He retaliated by punching her in the abdomen and they started fighting.