On cross-examination, the boy said the sun was out when the incident occurred. Two forensic pathologists have testified the baby died between 1:15 a.m. and 3:15 a.m. Aug. 30, 2005.
After the boy's testimony, defense attorneys for China Arnold, 28, rested their case following seven days of testimony. Arnold has pleaded not guilty to aggravated murder. She could face the death penalty if convicted.
Prosecutors discount attempts to point the finger away from Arnold, saying her former cellmate claims Arnold confessed to her and described putting the child in the microwave.
A judge declared a mistrial in Arnold's previous trial after he privately heard testimony from the juvenile who testified Tuesday.
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