A "short, fat" man in his 50s could be the person police are looking for in connection with the Kovan double murder.

Chinese morning daily Lianhe Zaobao said on Friday that the suspect was a man in his 50s. Evening dailies Lianhe Wanbao and Shin Min Daily News also said the suspect was in his 50s, and added that he was "short" and "fat".

He was said to be wearing an orange and white striped shirt and blueish grey jeans at the time of the killings.

A maid living in the Hillside Drive neighbourhood apparently saw the man fleeing from the scene in a car at about 3.45pm on Wednesday.

Mr Tan Boon Sin, 67, who owned a car workshop in Auto Bay @ Kaki Bukit, was killed in his home. His older son, Mr Tan Chee Heong, 42, was seen staggering out of the house before collapsing in a pool of blood.

Someone then drove the elder Mr Tan's Toyota Camry out of the house, in the process running over the younger Mr Tan and dragging the body more than 1km before it was dislodged outside Kovan MRT station.

The abandoned car was found on Thursday morning in a quiet part of Eunos industrial estate. It was barely 1km away from where the elder Mr Tan's workshop was formerly located, before he moved to Kaki Bukit a few years ago.

The elder Mr Tan was said to have two sons and a daughter.

Shin Min quoted the daughter as saying the family was in deep shock and mourning, and could not accept the tragedy.

A dispute, possibly over money matters, is believed to have led to the killings.

Reports noted that the doors to the Hillside Drive home had not been broken into, how the suspect seemed to know where the keys to the Camry were, and how he also knew to abandon the car in a quiet spot.