The police officer charged with the double murder at Kovan was remanded for another week for investigations.

Iskandar Rahmat, represented by Mr Ferlin Jayatissa and two other lawyers from Lexcompass LLC, allegedly committed murder by causing the death of car workshop owner Tan Boon Sin, 66, and his son, Chee Heong, 42, a businessman, at their Hillside Drive home on July 10.

The younger Tan was stabbed and dragged by the family's car apparently driven by the 34-year-old Iskandar. The body was dislodged about 1km away near Kovan MRT Station that afternoon.

The senior staff sergeant was arrested in Johor after a 54-hour manhunt on July 13.

At Monday's brief mention, the prosecution told the court that Iskandar was warded in Changi General Hospital from July 15 to 21 due to an infection on his right hand.

The prosecutor sought a further week's remand.

Iskandar's lawyer told reporters that he had been briefed by the family last week. His application to speak to Iskandar for a while was turned down by the prosecution as investigation is still ongoing.

Iskandar will be back in court on July 29. If convicted, he faces the death penalty.