The muscle-bound marsupial famed for his size died on Sunday.
Roger rose to internet stardom in 2015, after pictures of his bulging biceps, and barrel-like chest surfaced online.
He stood at an impressive 6ft 5in (1.95m), and according to the Daily Mail, he enjoyed crushing metal buckets between his palms for fun.
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Roger was a resident at The Kangaroo Sanctuary in Alice Springs in Australia, and had been for 10 years.
The sanctuary boss, Chris "Brolga" Barnes, announced Roger's death in an emotional Facebook post.
Mr Barnes said Roger lived a lovely long life and was loved by millions around the world.
"We will always love you and miss you Roger".
"Ten years ago I built this sanctuary to house Roger, and a couple of his wives. Roger was our alpha male for many years, and he grew up to be a kangaroo that people all over the world grew to love, as much as we love him too."
The post has received more than 20,000 heartfelt messages of support.
"RIP Roger, I hope wherever you are there's endless buckets for you to crush."
"He lived a rich and full life and brought joy to people all over the world. RIP The King."
"Thank you for loving him so much. A life lived fully and proudly. Roger was so lucky to have found you and you him. He will always be magnificent."