Bistro Burger—a chain of eateries founded in San Francisco in 1993—recently closed its last location in the city.

The closures are due to the passing of Adrian Bonnar, founder of the Bistro Burger chain. He died in July 2015, his niece said.

Since Bonnar's death, locations at 201 Mission St., 333 Bush St., 343 Sansome St., and most recently, the Westfield San Francisco Centre mall have shuttered.

Bonnar “had a plan to offer great food served quickly in an inviting and friendly environment,” read the company biography on the Bistro Burger website, which is no longer active.

“He was a great man,” one tipster who knew Bonnar told Hoodline.

In recent years, most Bistro Burger locations had received mixed feedback, with complaints about service but some praise for the food.

“I had a salmon burger with fries and it was DELICIOUS,” said one Yelper. “It was well worth it and tasty.”

The Westfield closure is one of several recent departures from the shopping center.