She was 29.
NBC News said Allemand's boyfriend, professional basketball player Ryan Anderson, discovered Allemand in her New Orleans home Monday night. He called 911, and she was rushed to University Hospital where she was placed on life support.
The nature of her injuries was not immediately disclosed to the media.
"Due to a critical loss of brain and organ function, life support was withdrawn," her family's statement read. "Ms. Allemand passed away peacefully with her mother, boyfriend and other life-long friends by her side. Loved ones and fans will remember Gia Allemand as a caring woman who loved her family and was well-known for her compassion towards animals and mission to rescue homeless pets."