Mayra Rosales before and after shedding weight     Photo: Courtesy

A 70-stone woman once dubbed the 'half-ton killer, has lost nearly 80% of her bodyweight after undergoing 11 operations aimed at helping her shed the pounds.

Mayra Rosales, 34, was given the name after falsely claiming she had accidentally killed her nephew by rolling on him.

She tried to protect her sister Jamie by taking the blame for the death of her nephew Eliseo in 2008.

Her claim was proved false after autopsy results showed he died from multiple injuries to his skull, the Daily Mail reports.

Her trial hit the headlines after she had to be cut out of her house to attend court.

Jamie eventually confessed to the crime and was jailed for 15 years.

Mayra Rosales in 2008                    Photo: Dailymail

Mayra Rosales decided in 2011 to shed the pounds to be able to take proper care of her sister's other children.

She underwent 11 different operations, including skin removal procedures, to shed the weight and altered her relationship with food.

She told ABC13: "Food to me is I have to eat to live.

Before it was living to eat, and now you know, it's just something normal."

Miss Rosales was treated by a top doctor in Houston, Texas, losing 5kgs in the first ten days alone.

She lost another 227kgs before having lap band surgery.

Miss Rosales posted on her Facebook page last month about her skin removal operation. Here is the photo:

Mayra Rosales in 2015                    Photo: Dailymail