A 42-year-old man died after being stabbed outside a Jalan Besar pub on Monday night, in a case that has been classified as murder.
Witnesses said Mr Chua Meng Guan had challenged his assailant to a fight before a scuffle broke out outside the pub and the hostel next to it.
He was later found on the floor, bleeding profusely from wounds in his chest, where he had been stabbed with a knife.
His assailant was nowhere to be found. Police said they received a call for help at 11.19pm.
Mr Chua was pronounced dead at the hostel, called The Trey, around 10 minutes later. No arrest had been made at press time.
This is the third case of unnatural death in three days that the police are investigating, after incidents in Yishun and Geylang on Saturday.