PINE HILLS, Fla. -

A candlelight vigil was held Sunday for a China Wok employee gunned down almost a year ago.

Last September, 53-year-old "Anna" Sun was working at her Chinese restaurant on Pine Hills Road and Silver Star Road when a masked gunman barged in demanding money. Almost a year later, there has been no arrest.

At least four persons of interest have been questioned and cleared. Surveillance photos have also been released. On Sunday, Anna's sister, Nancy, came from California to ask for help in the case.

Orange County sheriff's Detective Eric Debose told Local 6, "The night this happened, there were a lot of people out here and it doesn't matter how big or small it is, we can use any leads."

"If he is still on the loose, that means there could be many, many Anna's, many mothers," said Nancy Sun.

Anna's sister says she refuses to give up. Earlier this year, reward for information leading to an arrest was raised from $5,000 to $10,000.