It was the Coliseum’s mystery mural, until a teenage detective solved its 50-year puzzle

For decades, the curving mural depicting a golden sun has greeted visitors to the Los Angeles Memorial Coliseum.

Faded by the elements, its once-vibrant blue lost some luster over the years. The gold-leaf paint had chipped away. Still, the image drew eyes upward.

No one seemed to know who had painted…