The two men allegedly behind Wednesday's kidnapping for ransom, were lovers who have been living together for more than 10 years.
This was revealed by a woman who identified herself as the mother of 41-year-old Lee Sze Yong - the younger of the two suspects who were charged in court on Friday with the abduction of Madam Ng Lye Poh, 79.
Lee's mother, who wanted known only as Madam Seow, said her son and his 50-year-old accomplice Heng Chen Boon, share the Hougang flat with her. She told reporters, who were outside her flat on Friday, that Lee was her only son. "My son is in trouble, of course I'm very sad," she said in Mandarin.
According to local business records, Lee and Heng had started a cleaning company called Plus Concept together in 1999. But the company was terminated in 2001.
A neighbour, who only wanted to be known as Ms Chu, said recalled seeing the two men move cleaning equipment such as brooms and mops into a white car some years ago.
The two suspects have since been remanded in police custody for further investigation. The case against them will be heard again on Jan 17.