RONSON CANYON (CBS) — Authorities Thursday resumed their search for more body parts near the Hollywood sign after a human head, two severed hands and two feet were discovered earlier this week.

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A professional dog walker and her mother made the first gruesome discovery Tuesday when one of their dogs led them to the head, which was inside a grocery bag.

Lauren Kornberg tells CBS2 the experience left her shaking.

“I looked over and it rolled down the hill and fell into a ravine,” Kornberg said. “I thought it might have been a soccer ball. I turned to my mom and said it actually looked like a head, and so we thought it was maybe some sort of a movie prop. My mom was the brave one and she walked down into the ravine and got close and saw that there was eyes and blood in hair, and that it was, in fact, a human head.”

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Detectives Wednesday found two hands and two feet near the initial discovery in the 3200 block of Canyon Drive.

Authorities are hoping the hands are in good enough condition to get a fingerprint from the victim, a man believed to be in his 40s.

CBS2 spoke with a forensic psychologist who says the killer may be involved in organized crime and obviously wanted to draw attention to the murder.

“When someone commits a murder, you know, you can dispose of the body in places that are less sensational. And with the Hollywood sign, you know, it may be heard of around the world,” Dr. Don Hoagland said.

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LAPD officials, however, say they don’t believe that’s the case, but are continuing their investigation.