Lai, a San Francisco resident, was hit by an outbound 27-Bryant bus that was turning onto Bryant Street near 11th Street around 8:40 a.m. Friday, Muni spokesman Paul Rose said.
He was pronounced dead at the scene.
Around three dozen passengers aboard the bus were not injured.
The operator was placed on non-driving status and tested for drugs and alcohol, as is normal procedure in accidents, Rose said.
