Letter carrier Umeshkumar Thakkar died on the job in Little Elm this week.
The cause is still under investigation, with speculation that it may have been heat-related.
The president of his union said Thakkar's truck did not have air conditioning.
Vehicle driven by North Texas mail carrier who died did not have AC, union says
A North Texas mail carrier died on the job in Little Elm, with heat-related illness suspected as the cause, and his union noting his vehicle lacked air conditioning.
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