Preliminary investigations suggest that they are the same couple.
The recent aftershock had a 2.7 magnitude.
Several onlookers at the scene tried to save him but failed.
The 11-year-old left home in just his shorts on 29 Aug.
The two have since left Singapore, and will be banned from re-entering.
Authorities revealed the firm had branded itself as an “international financial services group headquartered in Singapore”.
EMAS and police officers were seen at the site of the accident.
The 21-year-old deceased was reportedly not part of the demonstration.
The man reportedly only returns home to his family once a month to settle bills.
MINDEF takes allegations of unacceptable workplace conduct seriously, it said.