An Australian-British dual national aboard the missing EgyptAir jetliner was a kind and loving father who had just welcomed a new baby.
Richard Osman worked as a geologist in the Australian goldmines before returning to Europe a number of years ago.
His younger brother Alastair said the 40-year-old father of two, who hailed from Wales, was admired for his strength and values.
"Richard was a very kind person, loving person, very focused. He was a workaholic and never deviated from the straight path," Alastair Osman told ITV News.
He said his brother had texted him to tell him he was an uncle for a second time on April 27.
"He's a new dad. A dad for the second time now and I know that would have filled him with love and joy," he said.
"It's funny how quickly things change."
Australia is closely working with UK authorities who are providing consular assistance to Osman's family.
"My thoughts are with the families and friends of those affected," Foreign Minister Julie Bishop said in a statement on Friday.
Osman said his brother was on board the EgyptAir flight MS804, which left Paris on Wednesday night, for work.
"He's been doing this for years in the gold mining industry. This was a regular trip. He used to do it at least once a month, year after year."
There were 56 passengers on the plane when it vanished about halfway between the Greek island of Crete and Egypt's coastline.
Egyptian and Russian officials say it may have been brought down by terrorists, and there are no signs of survivors.
