    |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 released|  lvesterday .    |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  Ishoot him ."