Man found guilty of killing woman, two daughters

HOUSTON Authorities say Garland Harper stabbed his girlfriend to death because he believed she was being unfaithful. He then tied up her daughters, 15-year-old Briana Roberson and 7-year-old Maya Love, and strangled them.

Prosecutors told jurors it took the victims just three minutes to die and it should take them even less time to find him guilty.

Harper's attorney argued he is mentally ill and was delusional during the murders.

Prosecutors are seeking the death penalty.

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