feuding neighbors that wound up becoming a murder trial. A California man taking the stand in his own defense to say he shot the guy next door because he feared for his life. ABC's Michelle Franzen... See More
feuding neighbors that wound up becoming a murder trial. A California man taking the stand in his own defense to say he shot the guy next door because he feared for his life. ABC's Michelle Franzen has more from the courtroom testimony. I shot him because I saw a pistol. Do you feel you had any other choice in. There was no other choice. Reporter: Michael in his own words on trial in vista, California, for shooting and killing his neighbor, John Upton. He's pleaded no guilty. Allegedly snapped after years feuding with Upton. They had their disagreements over some land. Over some brush. Reporter: The victim, of bullying and threats, driven to defend himself against Upton. I did everything reasonable to avoid deadly force. Reporter: On the stand, he recounting what he said for repeated tirades by Upton. Stop, cutting, trees. Reporter: The friction culminating last March was he out trimming shubry and Upton approached. He told me that this is not your land. Get the Out of here. I saw a pistol in his right hand. It was like one second. And, I pulled out my revolver and shot him. Reporter: Investigators say no other gun was found at the scene, but neighbors told ABC news they heard Upton taunting the man on a regularly basis. Two different sides to this neighborly feud turned deadly. For "Good morning America," Michelle Franzen, ABC news, new York.
This transcript has been automatically generated and may not be 100% accurate.