Quah Tee Keon claimed he had wanted to visit his sick child on Oct 13, the day of the attack.
His wife, Ms Loong Mei Ling, had taken their three sons, aged between two and six, from Singapore to their home in Triang, Pahang.
Quah said he took a bus to Johor and rented a car to drive to his double-storey house in Triang, reaching at about 3am.
He went into the house and saw his wife and her alleged lover, Mr Ruan Chao Kiang, in bed together. He went to check on his sick son and suddenly heard Mr Ruan crying out.
He then saw his wife covered in blood and Mr Ruan running downstairs. Quah also claimed that Ms Loong asked him to call an ambulance, but they didn't know the number to dial.
It was previously reported that Mr Ruan, who was in his underwear, had crawled down the stairs and died in the hall.
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