A man was struck by an SUV and killed overnight while walking on the southbound side of I-93, forcing investigators to temporarily close three lanes of the expressway.

The incident happened at approximately 12:30 a.m. as the victim was crossing the expressway near the South Bay Shopping Center in Dorchester.

The driver in the crash was taken to Boston Medical Center for treatment.

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Police are still investigating the death and trying to figure out why the victim was on the highway when it happened.