The Jeffrey Weisheit murder trial resumed on Monday in Clark County, Indiana.
The defense wrapped up with Weisheit taking the stand against the advice of his attorney.
Court officials say Weisheit described a relationship with the children's mother that was positive at times and had problems at other times. He testified in narrative form, without questions from his lawyers.
During his testimony, Weisheit admitted stuffing a dish towel into Caleb's mouth and then duct taping his mouth. He also acknowledged taping the boys arms behind his back, but he asserted he did all of that, perhaps in bad judgment looking back, because Caleb was misbehaving on the night before the fire.
Weisheit is accused of setting the fire that killed Alyssa and Caleb Lynch in their home two years ago.
Closing arguments are expected to begin on Tuesday morning in the case.
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