GD, I had an old Camp Mate from NS who lived near that murder scene. Next block. He say it is something to do with 4-D dispute. The story goes, a close relative had a dream, and the in the dream he saw 4-D number. But he had to go overseas for business trip, so he ask the couple to buy for him.
When he return to Sg, he checked and found his number tio liao. He then ask the couple for his 4-D ticket, but they denied they had the ticket, making some excuse that they forget to buy it because they were too busy with work.
This sort of Big Win, not possible to hide it. He find out that they indeed had bought the correct ticket, but once they find out it 'tio,' they denied they bought the ticket.......they just quietly go and collect the money and keep for themselves.
So, the guy just keep quiet and never complain. Patiently wait for the right time to strike. Then one day, when he see the parents go out to work, he approach the door and ask the kids to let 'uncle' in. The rest is history.......
Hence, no sign of forced entry.