Luper Writing News Today

>> he said he had to do it. it was self-defense. people were trying to hurt him. >> reporter: david, the trial is expected to last two to three weeks. he could face life in prison. david? >> alex perez in wisconsin. alex, thank you. we turn now to the deadly shooting on that movie set. tonight, abc news obtaining a resignation letter from a camera operator on the crew the night before the fatal shooting and what that letter claimed. heres abcs kaylee hartung. >> reporter: tonight, abc news obt...