A childhood friend of the Quebec man killed in a Florida boat explosion earlier this week says one of the victim鈥檚 sisters was among the other six passengers injured in the blast.

Thi Cam Nhung L锚 says she grew up with Sebastien Gauthier in Quebec City and considered him her best friend.

L锚 says Gauthier鈥檚 older sister was also on the boat in Florida鈥檚 Broward County when it exploded and she was taken to a hospital.

She says Gauthier鈥檚 family was in Florida to celebrate the holidays and that his sudden death feels 鈥渦nimaginable.鈥�

A video posted on social media Monday shows the vessel engulfed in flames following the explosion, with a thick column of black smoke billowing into the sky.

The Florida Fish and Wildlife Conservation Commission has confirmed that Gauthier died of his injuries, saying a preliminary investigation shows the 37-foot vessel exploded after its engines were started.

L锚 remembers Gauthier as someone who was always smiling and says she is waiting for answers about what led to her friend鈥檚 death.