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A winter storm that authorities warned could be "catastrophic" has been linked to at least six road deaths across the South, including a Dallas firefighter killed at the scene of a crash.

Two people were killed in Mississippi by storm-related car accidents Tuesday, and NBC Dallas-Forth Worth confirmed four deaths connected to the storm in Texas on Monday and Tuesday.

A Dallas firefighter died when he was thrown from a bridge on Monday while at the scene of a crash on a highway overpass.