JACKSONVILLE, Fla. --A Yulee family is making a plea to the public to help police solve the murder of their loved one.

A female security guard was shot and killed in the parking lot of a fast food restaurant on the Southside while she was on duty. Two months later there are still many unanswered questions.

Sibyl Bernard is waiting for answers.

It's been 60 days since her sister was shot and killed. On Wednesday, July 31, Brenda Williamson went to work. She was a roving security guard for Universal Protection Service and worked the graveyard shift, but something happened in the overnight hours. Police found her dead inside her work pick-up truck parked at the McDonald's at Bonneval Road and JT Butler. She was 50-years-old.

"You think, can we just rewind to Wednesday? Can we go back to that Wednesday before and say you know what Brenda don't go to work," saidBernard.

Williamson was not an armed security guard and police say she was not robbed. The Jacksonville Sheriff's Office believes she was shot sometime between 3:00 and 5:30 a.m. Thursday, August 1.

"Her last log-in was at 12:30 that night, but she didn't have necessarily checkpoints, so she didn't have to call in," said Bernard.

With no arrests and no definite leads, Bernard says her sister's 26-year-old son, her husband and the entire family are struggling with the uncertainty.

"I myself have a hard time dealing with it on several different levels. One, the fact that I've lost my sister and another, the fact that I have my parents that are, they're the rock of the family and its like watching sand run through your fingers, they're crumbling," said Bernard.

Williamson's birthday is coming up in November. Bernard says since she and her two sisters have birthdays one after another, every year her mother would buy all of their birthday cards at the same time, but this year is different.

"The only answer I couldtell her, 'Mom go and buy her the birthday card and read it to her at her grave and place it at her grave,' and that's probably one of the hardest things I've ever had to say to my mom and then I stopped to think how in the world I just said that to her," said Bernard.

The Jacksonville Sheriff's Office is still asking for the public's help in this investigation. If anyone remembers any suspicious activity at the McDonald's on Bonneval and JT Butler inthe early morning hours of August 1,contact Crimestoppers at 1-866-845-TIPS.

There is a $3,000 reward for any information that leads to an arrest.