Alexander became the first confirmed British casualty of Friday night's attack on Paris which left 129 dead, and 352 wounded.
Alexander's family issued the following statement on Nick's death:
It is with huge sorrow that we can confirm that our beloved Nick lost his life at the Bataclan last night.
Nick was not just our brother, son and uncle, he was everyone's best friend - generous, funny and fiercely loyal.
Nick died doing the job he loved and we take great comfort in knowing how much he was cherished by his friends around the world.
ISIS has since taken responsibility for the attack, which is the worst on French soil since World War II.
Survivors of the attack on the Bataclan described the terrorists shooting hostages one by one, and stopping three times to "calmly" reload.
Paulina Buckley, Alexander's girlfriend, wrote the following heartbreaking tweet after hearing of the attack:
Please help me find Nick Alexander #Bataclan #ParisAttacks pic.twitter.com/eFUObFxPGR
- Polina Buckley (@polinabuckley) November 14, 2015
You are and always will be the love of my life, Nick Alexander #fuckterrorism #ParisAttacks #Bataclan pic.twitter.com/C2pxvLwCth
- Polina Buckley (@polinabuckley) November 14, 2015