The Week in Photos: Two 40-year-old cold-case murders are solved, and crews race to protect L.A.'s water lifeline

Hello, and welcome to this week's selection of top stories in pictures by Los Angeles Times photographers.Forecasters are predicting a weeklong heatwave and the threat of widespread snowmelt in the Sierra Nevada.As the historic Sierra snowpack is expected to melt into runoff that is 225% of normal, work crews are scrambling to shore up flood defense along the Los Angeles Aqueduct - L.A.'s water lifeline.

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