She was one of 129 people killed and 352 more injured in the co-ordinated terror attacks in six locations throughout Paris.
Ms Boissinot was currently in Whangarei and would travel to Auckland shortly, from where she would fly to France tonight.
"She's not good at all. Really not good at all," he said.
A friend of Chloe's was the last to see her as he fled from the restaurant.
Ms Boissinot, who has been in the country for the past two months, had been waiting to hear from family currently in Paris about the whereabouts of her older sister.
In the confusion, terror and panic the pair became separated. Chloe's partner was himself shot in the hand and taken to hospital.
Ms Boissinot had not heard of her sister's condition last night when spoken to by the Herald.
However, she and her mother, Elisabeth, have posted of their loss on Facebook and how Chloe's life had been taken after being shot.
"Thank you all for your support," Mrs Boissinot's translated post read. "Farewell my little heart ... my love my life."
"Chloe.. My daughter.. My victim of terrorism," her translated post read. "We are hundreds of mothers.... I've seen them cry like me.... I'm not alone...I love you.. My darling, my child. My pain in the heart."
Ms Boissinot's page has been flooded with messages of condolence and earlier this morning she thanked all her friends for their solidarity, strength and support, in her post translated to English.
"Chloe was full of life and in good health, I want us to keep all this beautiful image of it in our minds ... A big thought to my family ... My little angel, I think of you, I know that you're okay. I love you."
Online French newspaper, La Nouvelle Republique, is also reporting her death after reading Mrs Boissinot's Facebook post, saying Chloe's body was eventually identified on Sunday afternoon local time.
Miss Boissinot yesterday told the Herald she'd heard a rumour her sister may have been shot in the shoulder but she didn't know.
She said she would stay in New Zealand until her sister was found before deciding whether to head home to her family.
"If she has died, yes, I will go back to France, of course."
Ms Boissinot could not be reached for comment.
