Her boyfriend, NBA player Ryan Anderson, broke his silence in a statement made to US Weekly on Wednesday.
"I'm deeply grateful for all the love and support we have received from family, friends, and fans," the Pelicans player said in the statement. "Gia was the most beautiful person I knew inside and out, and she always smiled and made everyone else around her smile."
"She had such an amazing impact on my life and anyone that knew her was blessed," he continued. "All I have left is to cherish those memories we made together and help perpetuate the many values, faith, and love that we shared."
According to TMZ, the reality TV star attempted to hang herself in her home on Monday, when Anderson found her and immediately called 911.
Allemand, 29, was then taken to the University Hospital in New Orleans and was in critical condition.
"Due to a critical loss of brain and organ function, life support was withdrawn today," said her rep. "Ms. Allemand passed away peacefully with her mother, boyfriend, and other life-long friends by her side."
"Bachelor" alumni and friends of Allemand showed their support on Twitter, following the news.