Mr Tan Boon Sin was an avid hobbyist fisherman who went on regular overseas fishing trips, said a fellow fisherman.
He was in fact scheduled to go on another fishing expedition, to Kuching in Malaysia, next Monday, said Mr Alan Tan.
He described Mr Tan as a friendly, jovial man who seemed younger than his age.
Police said Mr Tan Boon Sin was 67, not in his 70s as earlier reported.
Mr Tan, who owned a car business in Kaki Bukit, was killed on Wednesday afternoon in his 14J Hillside Drive terrace home in the Upper Serangoon area.
The body of his son was lying about 1km away outside Kovan MRT station.
The son, who was 42, had earlier been struck by a Toyota Camry at the Hillside Drive home. A witness had seen the son stagger to the gate, bleeding.
The car dragged the body along Upper Serangoon Road before it was dislodged.
A police manhunt is still on for the driver of the Camry, which was found abandoned in Eunos - about 950m from where Mr Tan Boon Sin's workshop used to be - on Thursday morning.
A police statement said that on Wednesday, police got a call for help at 3.41pm "regarding an accident between a car and pedestrian".
A 42-year-old male was pronounced dead outside Kovan MRT station by paramedics at 3.53pm.
"Police investigation at the scene led to the discovery of the body of a 67-year-old male in the vicinity and he was pronounced dead at 4.51pm," said the statement.
The police has classified the case as murder under Section 302 of the Penal Code, Chapter 224, which carries the death penalty.