A 48-year-old man died after an attacker plunged a knife into his waist during an argument at a Geylang coffee shop on Sunday night.
Bleeding and visibly weakened, he stumbled to the turning lane at the junction of Sims Way and Guillemard Road, a few metres away from the outdoor dining area.
He died an hour later at a hospital.
While it is not clear what sparked the fight between the two men who appeared to know each other, witnesses said that it could have been over a woman.
The assailant, described as having white hair and wearing a red cap, fled the scene.
The police said they arrested a 55-year-old suspect yesterday. They have classified the case as murder.
The men were having a meal at the coffee shop, Choy's House, at Guillemard Road near Geylang Lorong 8 when they started arguing before 9pm.
A witness, who wanted to be known only as Mr John, said: "They were not arguing very loudly. So I'm not sure what it was about. It could have been over a woman."
He said that the men behaved as though they knew each other. They had ordered beer, but Mr John could not tell if they were drunk. Another witness told Chinese newspaper Shin Min Daily News that the victim then hit the other man in the face.
This prompted a few others sitting nearby to intervene and separate the two.
The victim then stormed off but returned after 15 minutes and demanded that they discuss their matter by a four-faced Buddha statue (left) beside the main road.
When the other man refused, the victim grabbed him and pulled him to the statue.
It was there that the man pulled out a knife and plunged it into the left side of the victim's waist, witnesses said.
The victim fell to the ground as his attacker ran off in the direction of Lorong 4.
The police were called. Officers found the victim lying motionless and bleeding.
He had no pulse and was not breathing, said a Singapore Civil Defence Force spokesman.
Paramedics performed cardiopulmonary resuscitation on the victim as he was taken in an ambulance to Tan Tock Seng Hospital, where he was pronounced dead.