Transcript for Murder Suspect Acting as His Own Attorney Calls First Witness
About your son, nick? I'm sorry I have to ask that, sir. Do you need a minute? Of course, not. Reporter: In this crowded georgia courtroom, there were more tears tuesday, this time from the ex-husban of karmen smith, the flight attendant police say waseem strangl in 1995. He said he had an argument with his ex-wife the morning of her murder. But said he had nothing to do with the attack. Mr. Smith, did you have anything to do with the murder of karmen smith? Absolutely not. Reporter: Police say daker stabbed her son 18 times. In a bizarre twist of revenge against loretta blatz. I don't know why you would frighten me. And you know you frightened me. And I don't appreciate it. Maybe you're scared of me. But that you always think I'm going to kill you. I know things to worry about better than you. Reporter: On tuesday, daker's first full day presenting his defense, jurors heard from his witnesses for the first time. The owners of the point ball group say it was blatz who was obsessed with daker. At that point, she wasn't allowed to play anymore because I was concerned about the relationship. And I didn't think it was a good situation for you to be in. After she had restraining order, she wanted to play? Absolutely. Reporter: This morning, the would-be lawyer maintains his innocence, as more witnesses, and everyone is waiting to see whether he, too, will testify, as the law allows. For "good morning america," steve osunsami, abc news, atlanta. It's so tough for those witnesses on the stand.
This transcript has been automatically generated and may not be 100% accurate.