NEW : Ross Harris terminated by CNN , spokeswoman says . Lawrence Zimmerman retains defense attorney Leanna Harris . Investigators try to simulate the heat inside the car that killed a Georgia toddler . The Home Depot weather experts think the temperature may have reached a couple of miles .
NEW : Ross Harris terminated by The Home Depot , spokeswoman says . Leanna Harris retains defense attorney Lawrence Zimmerman . Investigators try to simulate the heat inside the car that killed a Georgia toddler . CNN weather experts think the temperature may have reached 140 degrees .