BRUNSWICK, Ga. (WCTV Eyewitness News) – A prosecutor is pressing the ex-wife of a Georgia man about how well she really knew him before their toddler son died in a hot SUV.

Justin Ross Harris is charged with murder in the 2014 death of his 22-month-old son, Cooper. His ex-wife, Leanna Taylor, testified Monday as a defense witness that Harris wouldn’t have left the child to die intentionally.

But prosecutor Chuck Boring pressed Taylor on cross-examination about how little she knew of her then-husband’s “double life.” Evidence has shown that around the time of the boy’s death, Harris had met a prostitute for sex and was sending sexual text messages to a teenage girl.

Taylor said she and Harris had been in counseling for sex-related problems but she didn’t know “the depth” of his deceptive behavior.