A former astronaut who has been aboard the International Space Station and the Mir Space Station reportedly shouted "Earth must be warned!" before attempting suicide in December 2008.
Claudie Haignere, 59, had to "be restrained" after yelling the strange warning just before slipping into a coma caused by an overdose of sleeping pills.
UFOmania released a six-minute YouTube conspiracy film laying out her story. The video has been seen over a million times.
Haignere was a backup crew member for the 1993 Mir Altair mission, which included her future husband, Jean-Pierre Haignere.
In 1996, she visited the Mir Space Station as a member of the Russian-French Cassiopee mission and made it to the International Space Station as the first European woman in 2001.
Asteroid 135268 was given the name Haignere in honor of Claudie and her husband.
After retiring as an astronaut, Haignere became a French politician and served her country as minister delegate for research and new technologies from 2002 to 2004 and minister delegate for European affairs from 2004 to 2005.
After budget cuts were announced for her field of scientific research, she left politics to work in a Pasteur Institute biology lab.
Soon after, in December 2008, she was rushed to the hospital after overdosing on sleeping pills.
She has since denied that the incident was a suicide attempt, blaming it instead on a serious case of "burnout."
Conspiracy theorists continue to insist, however, that Haignere tried to warn people about an alien threat.
The blog Mysterious Universe states: "One theory is that she was convinced that Earth had been visited in the past by aliens who genetically engineered the human race."
"This could be linked to her work at the Pasteur Institute where some sources reported she was working on 'human/alien DNA research.'"
A fire that broke out on Christmas Eve, 2008 at the Paris lab where Haignere worked further fuels the conspiracy theories. A total of 17 fire engines attended to the fire at the institute, Daily Star reports, and yet the cause of the fire remains unknown.
Critics of the conspiracy theories find the claims of alien DNA work to be preposterous and consider Haignere's warning about aliens to be a product of her overdosed mind.
The scientist has yet to deny the outrageous claims.