The UA's Sigma Kappa chapter reports that Duarte was in attendance at the Route 91 Harvest Festival, where 58 were killed and more than 500 were injured.
Below is statement from the sorority:
"The Zeta Omicron Chapter is aware that one of our alumna members, Christiana Duarte, is missing following the Route 91 Music Festival in Las Vegas. As we await word of Christiana, Sigma Kappa is supporting our members and is praying for all of those impacted by this tragedy."
According to social media posts from friends, Duarte's phone was found and she does not have an ID with her. A family friend told KGUN9 Duarte's parents and family are in Las Vegas searching for her.
Duarte was with a friend at the concert. Friends say Duarte's friend who was shot and underwent surgery Monday.
The Tucson Roadrunners confirm Duarte was an intern with the team before she graduated. According to her LinkedIn page, Duarte is working for the Los Angeles Kings as a fans services associate.