Lover believed to be wife's chauffer

A report in The New Paper states that Hsu had hired Mr Ittiphan as a chauffeur for Ms Siriwan.

Reporters from the paper visited Hsu's last known address in Singapore - an HDB flat on Yishun Ave 11 - on Sunday, but were turned away by a man who answered the door.

He refused to say whether he was related to Hsu.

There are also conflicting local news reports about the relationship between Hsu and the residents of the Yishun unit.

One report stated that Hsu is related to the residents in the unit but were unaware of the stabbing case, whereas another said that Hsu had rented the unit and did not own it.

Victim known among car drifting community

Mr Ittiphan is known to some of the drifters in Singapore and Malaysia, who expressed shock when news broke about his death.

Local drifter Benjamin Cheah, 20, told The New Paper: "I was shocked to hear the news. It's sad to know that he passed away in such circumstances."

Mr Ittiphan is often seen at drifting events in Thailand and while he wasn't one of Thailand's top-ranked drifters, he had been in the Thailand drifting scene for many years.

Mr Cheah said that the two knew each other as casual acquaintances and would exchange greetings whenever they saw each other during events at the track.

He also said that Mr Ittiphan had a purple Nissan Cefiro which he used in drift events in Bangkok.

Mr Cheah told The New Paper that his Thai friends had not seen Ms Siriwan and Mr Ittiphan together.

However, a Thai friend revealed to Mr Cheah that Ms Siriwan had told Mr Ittiphan that she wanted to end their relationship just the day before the fatal stabbing took place.