Craig Stanley Mackintosh, 48, is believed to have been shot dead on Wednesday last week when his squad was ambushed. (photo courtesy of MSN,com)
The sister of Craig Mackintosh said he had been killed in action on August 24, and has launched an online fundraiser to repatriate his body.
"Our brother bravely volunteered to go... as a medic to help save lives in this war-torn country," Lorna Mackintosh wrote on the GoFundMe page.
"In the line of duty, helping others he lost his life. This selfless man is currently stranded in a morgue in Ukraine and there is no help to get him home," she added.
The page has already raised almost double the £4,500 ($5,222, 5,208 euros) target required to pay for his body to be returned to the UK.
"He needs to come back home to have the service he deserves. A true hero's service surrounded by his family and friends," she added.
The Foreign Commonwealth and Development Office said it was supporting the family of a Mackintosh, who came from Norfolk in east England.