A new documentary is set to reveal the astonishing true life story of a woman who testified falsely to murder but was found innocent on the grounds that her burgeoning obesity could never have allowed her to commit the crime. TLC's Half-Ton Killer? tells of how, in March 2008, Texan Mayra Rosales, 31, told police officers that she had killed her two-year-old nephew, Eliseo Jr, by accidentally rolling on top of him while babysitting. Due to her 1,100lb frame, Mayra imagined her story to be believable, until doctors revealed that the boy could only have died from a blow to the head. Then her attorney's main argument for her defense became the reality that she was so big she couldn't move her arm.

After lying to the authorities, Mayra eventually confessed the truth. She had invented the story to protect her sister Jaime, whom she claimed had struck the boy various times over his body with a hairbrush earlier the same day.