    Sentence 1: Dotson , 21 , admitted to  FBI agents that he shot Dennehy in  the head" because Patrick-had tried  to shoot him ,;." according to an  arrest warrant réléased yesterday .    Sentence 2: According -to an arrest  warrant released Tuesday. , Dotson  admitted to FBI agents that he shot  Dennehy in the head " because  Patrick had tried'to shoot him."