The family of 38-year-old Keesha Gray of Detroit has now hired a lawyer to investigate her death at the Metroplex Mail Distribution Center in Pontiac.
She's one of five workers to die on the job in 14 months, the latest happening in October of 2015.
Gray died from Bronchial Asthma in June of 2015. Her attorney Brian McKeen tells us she felt sick that day at work and told her managers she was going to her car. That's where he says she collapsed, died, and she wasn't found for nearly two hours.
McKeen says, "If it's proven that methane gas was to blame, we need to figure out who's responsible and hold them accountable."
The Inspector General found the methane gas detection system was not working correctly for months in 2015, but testing found gas levels were safe, and the district office told us workers were never in danger.
APWU officials says they question why no managers realized she was gone for so long.
Federal lawmakers have written a letter to the Postmaster General about their concerns on the methane alert system.
The American Postal Workers Union is planning a large rally for sometime during the next three weeks.
