SINGAPORE- His flatmate found him lying unconscious on the floor of their rental flat on Dec 7 and called for an ambulance.
It was only at the Singapore General Hospital that it was discovered that Mr Lim Lay Hock, 60, had a broken collarbone, a fractured rib, which had punctured his lung, and head injuries, his daughter said.
By then, he was in a coma. He died without regaining consciousness nearly two weeks later, on Dec 20.
But it remains a mystery how Mr Lim ended up in such a state.
In a Facebook post last Sunday, his daughter, Fion, 31, wrote that she believes her father was the victim of a violent robbery and appealed for eyewitnesses to help her find her father's killer.
"To the robber who assaulted my dad and caused his death, I really don't understand how you can beat up a 60-year-old man so severely and live the rest of your life," wrote the oldest of his three children.
The family believes Mr Lim was robbed on Dec 7 around the York Hill estate, near Chin Swee Road in Outram, where he shared a one-room rental flat with a man in his 70s.
Ms Lim told Chinese evening daily Lianhe Wanbao that she discovered that more than $30,000 of her father's valuables were missing only after she found out about his injuries.
They included his Rolex watch, a gold chain and a gold bracelet.
"It will be good if you can educate your old folks not to wear valuables when they are out alone," she wrote on Facebook.