A 19-YEAR-OLD Findon man stabbed to death in Light Square early yesterday had been celebrating a friend's birthday in a city hotel room before making a fateful decision to visit a nightclub.

Major Crime detectives continued their hunt for the killer last night, after learning the stabbing followed an earlier altercation involving the victim in Savvy nightclub in Waymouth St.

A small group of men, claiming to be friends of the victim, gathered in Light Square yesterday morning with one saying they had been celebrating a birthday at a hotel room when the victim decided to "go out".

When he did not return they went looking for him and found him being treated by ambulance officers.

The victim is believed to have been stabbed about 2.20am during a fight involving five to eight men on the eastern side of Light Square, outside the People's Choice Credit Union building. He was treated at the scene and pronounced dead on arrival at Royal Adelaide Hospital.

A 30-year-old Felixstow man, described as a friend of the victim, was also treated at the RAH for minor injuries before being released yesterday morning.

It was the second stabbing death in Adelaide in 48 hours.

"It is alarming that people carry knives with them," Major Crime Superintendent Grant Moyle said.

"I think it's a message that whilst people may not go out with the intention to kill anyone, if you're armed with a weapon a death can result."

Supt Moyle said police were yet to identify a suspect in yesterday's incident and urged anyone involved to come forward. Police have seized CCTV footage.