Iskandar Rahmat, a senior staff sergeant with the Singapore Police Force, was on Monday charged with the double murder of car workshop owner Tan Boon Sin, 66, and his son, Mr Tan Chee Heong, 42.
Dressed in a black T-shirt, he appeared calm and expressionless, and was looking around the courtroom to see if his family members turned up.
The bodies of the father and son were found 1 km apart in Kovan estate - the older man was discovered dead in a Hillside Drive terrace house, while his son's body was found near Kovan MRT station.
Iskandar, 34, faces the death penalty if he is found guilty.
Iskandar, who has been suspended from duty pending court proceedings, will be remanded at Central Police Division lock-up. The case will be mentioned again on July 22.