14 year old Sarah Johnson was killed in the blast July 24th in her family's home in Wilson.
Her sister Katie was seriously injured.
The lawsuit claims Judy Johnson, the girls' mother, called NOCO reporting the odor, but was never told to leave the house.
The suit also contends the Johnsons were never given any warnings, leading the family into a false sense of security thinking the smell was an odorant added to the gas indicating the tank was empty.
Jody Johnson, the father, disconnected the NOCO tank and hooked up to the line to smaller tanks he obtained.