Police said Stacie McCullough walked up to the 68-year-old victim and asked for directions.

When the woman said she didn’t know, McCullough tossed a cup of yellow liquid in her face and snatched her purse, according to police.

McCullough was also armed with a knife, police said.

“It surprised me someone would do that anywhere, so that person is not in their right mental state to do that to another human being,” said a Publix customer, who did not want to be identified.

A good Samaritan confronted McCullough and got the victim’s purse back.

Witnesses followed McCullough, and police arrested her a short time later.

McCullough claimed that the victim attacked her and told police that she suffers from bipolar disorder.

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Helen Gilbert places flowers on her brother Eurie Martin’s grave at Camp Spring Baptist Church in Sandersville. Her brother died eight years ago. Three former Washington County deputies are accused of causing his death and are set to stand trial Monday. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez