The Texas prosecutor shot to death in broad daylight outside a courthouse had feared for his life and carried a gun to work, according to a Dallas attorney describing herself as his friend.

Colleen A. Dunbar told CNN that she spoke with Kaufman County Assistant District Attorney Mark Hasse on January 24, and he told her he began carrying a gun in and out of the county courthouse on a daily basis.

Hasse was gunned down in the parking lot while going to work Thursday. Investigators on Friday were reviewing his caseload for possible clues about what led to his killing.

"He told me he would use a different exit every day because he was fearful for his life," Dunbar told CNN.

She said that Hasse offered no specifics on why he felt threatened, but only that he did. Dunbar said she was "shocked" by the killing.

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