NEW : Ross Harris terminated by The Home Depot , spokeswoman says . Leanna Harris retains defense attorney Lawrence Zimmerman . Investigators try to gauge the heat inside the car that killed a Georgia man . Initially , police said the death of the toddler was the result of tragic absent-mindedness . Harris says they think the temperature may have reached 140 degrees .
NEW : Ross Harris terminated by The Home Depot , spokeswoman says . Leanna Harris retains defense attorney Lawrence Zimmerman . Investigators try to gauge the heat inside the car that killed a Georgia man . Harris says they think the temperature may have reached 140 degrees .