The motto for the U.S. post office reads: "Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds."
But 43-year-old David Lindgren, of Sulphur, adds that stage four cancer won't stop him either.
"In February (of 2012) I was diagnosed with cancer. It was located where my stomach and esophagus met," Lindgren said.
After several bouts of chemotherapy and radiation, Lindgren had the cancer surgically removed. But it wasn't over.
"A few months later, I noticed a lump on my chest. Doctors sent it off and found out it was cancerous and that I had more cancerous lymph nodes," he said.
Today, he continues to fight the stage 4 cancer that doctors say is incurable but treatable. When he's not at work delivering the mail, he's in his third week of chemotherapy treatments.
"I love my job. I love the people. I just love delivering the mail. It's customer service at its finest," Lindgren said.
He admits though that it's hard sometimes but says he has to do what he has to do. He works with a feeding tube in a book bag on his back and a smile on his face.
"My God is bigger than any disease," he said. "My faith in Him, my family and my amazing support system is what gets me through."
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Sources say the man came into the restaurant with his family, got up and left, then drove his car into the building.