LOS ANGELES (CNS) — Authorities Friday sought public help to find a homeless man they say fatally stabbed a woman in the Hancock Park boutique furniture store where she worked.

Brianna Kupfer, 24, of Pacific Palisades, was found inside the store in the 300 block of North La Brea Avenue about 1:50 p.m. Thursday, the Los Angeles Police Department reported. She died at the scene.

Police said Kupfer was working alone at the time of the attack.

"The officers met with the reporting party, a customer who had entered the store and discovered the victim deceased on the floor," police said in a statement.

"Detectives have determined the suspect was not known to the victim and was a random walk-in to the store," police said. "The suspect attacked the victim with a knife and fled the scene through the back door."

A motive for the crime was not known, police said.

"The suspect was last seen on video surveillance, northbound in the alley to the rear of the crime scene," police said.

The man was described as Black, unknown age, tall and thin, and he was wearing a dark hoodie, sunglasses, a white N-95 mask, dark skinny jeans and dark shoes. He was carrying a dark backpack.

"Based on evidence discovered by detectives, the suspect is believed to be homeless," police said.

Anyone with information on this attack should contact West Bureau Homicide investigators at 213-382-9470; 877-LAPD-247; or Crime Stoppers at 800- 222-TIPS.