Truro man Chris Parry, who has been missing in Ukraine, has been killed, his family said.
In a statement issued by the Foreign Office, Rob, Christine and Katy Parry said: "It is with great sadness we have to announce that our beloved Chrissy has been killed along with his colleague Andrew Bagshaw whilst attempting a humanitarian evacuation from Soledar, eastern Ukraine."
Mr Parry, 28, and Mr Bagshaw, 47, were last seen heading to the embattled city of Soledar on January 6.
Mr Bagshaw's family said their cars were hit by a shell as the two men tried to rescue an elderly woman.
They said: "His selfless determination in helping the old, young and disadvantaged there has made us and his larger family extremely proud.
“We never imagined we would be saying goodbye to Chris when he had such a full life ahead of him.
“He was a caring son, fantastic brother, a best friend to so many and a loving partner to Olga.
"Chris was a confident, outward-looking and adventurous young man who was loyal to everyone he knew.
“He lived and worked away as a software engineer but Cornwall was always his home.
“He loved rock climbing, cycling, running and sky-diving and wanted to travel the world.
"He found himself drawn to Ukraine in March in its darkest hour at the start of the Russian invasion and helped those most in need, saving over 400 lives plus many abandoned animals.
"It is impossible to put into words how much he will be missed but he will forever be in our hearts.
"We feel so privileged that he chose our family to be part of."
Mr Parry and Mr Bagshaw had been in the Donetsk region of eastern Ukraine doing voluntary work.
Truro and Falmouth MP Cherilyn Mackrory said on Twitter: "My deepest condolences to the family of my constituent Christopher Parry, whose death in Ukraine has been confirmed by the Foreign Office.
"My thoughts are with his family at this time, and I understand they are receiving support from Foreign Office staff."