He may have been killed in a beef stew that started on duck gravy.

A longtime colleague of the Chinese food delivery boy who was shot and killed in Forest Hills on Saturday told the Post that the disgruntled customer wanted to be questioned by cops in the murder initially harassed the joint over how much duck sauce he was getting. he had given her.

One evening late last year, “The customer came in and ordered food,” recalled Soi Chung, 70, a Great Wall restaurant worker. “He left with the food but came back and said, ‘It’s not enough. He came to the counter and wanted more food, more duck sauce.

“They had a fight and the boss said, ‘Enough is enough,'” said the employee, who has worked at the Queens restaurant for 20 years. “The guy left the restaurant and came back later and threw the duck sauce, everything, everywhere. So the police came and made a report, but the guy was gone.

Chung said the enraged customer only became bolder and more dangerous.

“After that, sometimes he was waiting outside,” Chung said. “He would say to the boss, the delivery man and one of the chefs, ‘I remember you. I remember you.’ “

A worker at the Great Wall Chinese restaurant said the man was wanted for questioning by police in the shooting death of delivery man Zhiwen Yan who was harassing restaurant workers.
Ellis Kaplan
First responders at the scene of the shooting in Forest Hills on April 30, 2022.
First responders at the scene of the shooting in Forest Hills on April 30, 2022.
Robert Mecea

Chung and another employee said the angry 50-year-old boss even pulled a gun on staff members in January and vandalized their cars, including slashing the tires on the manager’s car.

Chung said the harassment ended when workers reported the firearm incident to cops.

Police are now investigating whether tragic immigrant Zhiwen Yan, 45, was targeted by the client, with detectives looking to question the man, according to police sources.

Yan, a married father of three who emigrated from China about 20 years ago, was making a delivery near 108th Street and 67th Drive in Forest Hills around 9:30 p.m. Saturday when he was shot in the chest and dropped his scooter.

He was rushed to Elmhurst Hospital, where he was pronounced dead.

Yan, an immigrant from China, was working at the time of the shooting.
Yan, an immigrant from China, was working at the time of the shooting.
Yan leaves behind a wife and three children.
Yan leaves behind a wife and three children.
Yan's wife, Eva Chao, at a press conference outside her home on May 1, 2022.
Yan’s wife, Eva Chao, at a press conference outside her home on May 1, 2022.

Law enforcement sources said the description of the vehicle fleeing the scene of the fatal shooting – a former Lexus SUV – matches that of the client’s car.

The Post is withholding the customer’s name because he has not been officially named as a suspect or person of interest in the case.

People in the restaurant owner’s building next door described him as a threat on Monday.

“I call it ‘the Terminator,'” said a construction worker. “He goes in and out quickly. We had problems with him. He always wears those wraparound black sunglasses. Never say anything. Big guy. Silent. Stay for himself.

A memorial to Yan outside the Great Wall.
A memorial to Yan outside the Great Wall.
Ellis Kaplan

“He’s a hoarder,” the worker added. “He was grabbing people’s packages, and when they called him, he argued, shouted, denied. We have cameras all over the building.

Meanwhile, the Great Wall restaurant was closed for the second consecutive day on Monday. A memorial for the beloved slain delivery man has sprouted outside.