The attack happened around 12:30 p.m. in the area of Obispo Avenue and 64th Street.
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The woman was walking on the street when a man began attacking her, police said.
A bystander tried to intervene but at that point the suspect grabbed a Bird electric scooter from a nearby yard and continued beating the woman.
The suspect then fled the scene.
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Paramedics arrived and pronounced the woman dead at the scene.
Hours later, Long Beach police took a person of interest into custody in the general vicinity of the attack.
DEVELOPING: This story will be updated.