Kevin Kless, 23, a 2010 Temple grad, was repeatedly punched by three men who had gotten out of a car, which police yesterday described as an "older-model maroon sedan, possibly a Mazda," on Chestnut Street, between 4th and 5th.
The driver did not get out of the car, police said.
Police also described the four men as "light-complected" and "possibly Hispanic."
They said two were about 20 years old. One was thin, about 5 feet 10, and wearing a white shirt with blue stripes. The other was 6 feet, of medium build and wearing a maroon shirt.
A third man was about 6 feet 2. Police did not have further information on the fourth man.
About 2:25 a.m. Saturday, Kless, his girlfriend and another female friend, who had just left an Old City bar, were trying to hail a cab in front of the historic Second Bank of the United States on Chestnut Street.
Police have said Kless yelled at a cabbie, who briefly stopped, and who had his roof light on, indicating he was available, but who actually had passengers.
As Kless complained to the cabbie, the sedan pulled up behind the cab, and the four men inside began yelling at Kless, police said. They might have thought Kless had been yelling at them.
Then three men came out of the sedan and savagely beat Kless, who died 17 hours later at a local hospital. The assailants fled in their car. The taxi left the scene before the attack.
Police are hoping to speak with anyone in the sedan, the taxi or who witnessed the attack.
Tipsters are urged to call 215-686-TIPS (8477), or the Homicide Unit at 215-686-3334.
Tips, which can be anonymous, can also be submitted online at: www.phillypolice.com/forms/submit-a-tip.