A few hours after a US student tweeted "Thank you God for a nother year of life" on her 21st birthday, she collapsed and died.
Ariane Noelle Patterson was in a religious class at Gardner-Webb University in Boiling Springs, North Carolina, on Tuesday when she "lost consciousness after lunchtime", the Gaston Gazette newspaper reported.
Another student, who was a trained emergency medical technician, performed CPR on her until paramedics arrived, a spokesman for the university said.
Her classmates prayed for her in the hallway, spokesman Noel Manning added.
She died at Cleveland Regional Medical Centre in Shelby that afternoon.
"They said she had this outrageous love for Christ and for people," Mr Manning said after talking to Miss Patterson's friends, the Gazette reported.
"I really got a sense for how much she was loved."
On Twitter, her friends started the hashtag #PrayersforAriane. One friend tweeted that Miss Patterson was "the most inspiring person I ever met".
"Your contagious smile will never be forgotten!" another friend tweeted.
Mr Manning said it was not yet known why Miss Patterson, who was majoring in religious studies, died and the university was investigating if she had previous health problems.