A new lawsuit against General Motors Co. was filed by a couple from Georgia who already settled with the car maker a year ago due to the death of their daughter from a deadly car crash as a result of a defective ignition switch.

In the lawsuit filed on Monday in the state court of Marietta, Georgia, husband and wife Ken and Beth Melton indicted the automaker of deceitfully covering up vital evidence and letting a representative of the company lie while under oath.

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The couple claimed that the head design engineer responsible for the Cobalt ignition switches testified repeatedly that he had no idea about any design changes made to the switches, and that GM confirmed the designer's testimonials.

The legal counsel of the couple stated during the announcement of the new lawsuit that the recent disclosures of the company to the US Congress and the National Highway Traffic Safety Administration have exposed that the statements made by the design engineer were not true.

Attorney Lance Cooper also said that the Meltons might not have agreed with the settlement last year if they had known earlier that there was a cover up of important evidence of the committed.

GM had been bothered by dozens of legal complaints over the defective ignition switch that paved the way to the recall of over 2.6 million vehicles.

The faulty switch has the tendency to be shoved into the accessory mode while the vehicles are still moving, resulting to the shutting off of engines and immobilizing the power steering, airbags, and power breaks. This problem allegedly caused at least 13 incidents of death.

In a statement emailed by the company, a GM spokesperson relayed that there is no truth to the claims that GM maliciously concealed critical and relevant facts that has a connection with the Melton case.

The spokesperson also stated that GM denied that it conducted any illegal behavior in the said lawsuit.