Oakland police released a picture Wednesday of a silver car wanted in connection with the death of an Emeryville man who was shot by assailants who had rear-ended his car.

The four-door, mid-sized silver car had two men inside, one of whom shot and killed Aya Nakano on the 5800 block of Market Street in North Oakland, police said.

The new picture was released on the day that Nakano’s family announced that a reward for information has increased to $100,000.

Nakano, 22, had left a pick-up basketball game at UC Berkeley and was driving a silver Jeep Cherokee south on Market Street near Stanford Avenue when he was rear-ended shortly before 11 p.m. on June 12, police said.

Nakano and the driver of the other car pulled to the curb. After Nakano got out of his car, he and the two men who were in the sedan got into some sort of confrontation, police said. One of the other men pulled out a gun and shot Nakano dead, hours before he would have turned 23.

The two men fled south on Market Street.

On Wednesday, Nakano’s mother, Maria Climaco, stood with Oakland police, relatives and friends at the crime scene to ask for the public’s help. They stood in front of a bus bench emblazoned with a an ad that read “Reward $100,000” and “Justice for Aya!” and included a picture of Nakano. Similar billboards and ads on AC Transit buses will begin appearing in the next two months.

“I’m appealing to your sense of fairness,” Climaco said. “Ask yourself if it’s just and fair that people can commit such a senseless crime and be never held accountable for it.”

She also spoke of her son.

“Aya lived his life with so much joy and laughter. He was the eternal optimist. He had so much faith in people and was grateful for every little thing he had. Aya was also warm, compassionate, funny and generous. He was never judgmental, never confrontational and ever so trusting, which is why he was able to serve as a conduit to people from different backgrounds and interests.”

Nakano graduated from Sacred Heart Preparatory school in Atherton in 2008 and then attended the University of Oregon, graduating in 2012 with a degree in sociology.

Officer Johnna Watson, an Oakland police spokeswoman, said investigators have reviewed surveillance video tracing Nakano’s drive from UC Berkeley to the spot where he was killed. The picture of the silver car was taken from a surveillance video near the crime scene, said Watson, who declined to elaborate.

Police hope the picture of the car “may jog someone’s memory,” Watson said. “They may have seen something, heard something, or they may know something about the two occupants in this silver car.”

Anyone with information about the killing is asked to call investigators at (510) 238-3821 or (510) 777-8572. Tips can also be e-mailed to helpaya@oaklandnet.com.