The elephant famed for his giant tusks, known as Satao and aged around 45, was wounded by poisoned arrows in May in Kenya's vast southeastern Tsavo national park.
The Tsavo Trust, which works to protect the wilderness and its animals, announced the death "with great sadness" for one of the "most iconic and well-loved tuskers."
The death of the elephant, the latest in a surge of the giant mammals killed by poachers for their ivory, came a day after wildlife regulator CITES warned entire elephant populations are dying out in many African countries due to poaching on a massive scale.
"Rest in peace, Old Friend, you will be missed," it added.
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Poachers had hacked off the elephant's face and stolen the tusks, but conservationists who had followed Satao for years identified the body from the ears and other signs. The carcass was found earlier this month.
The famed elephant lived in a vast wilderness stretching over a thousand square kilometres a major challenge for rangers from the government-run Kenya Wildlife Service (KWS) to patrol.
"Understaffed and with inadequate resources given the scale of the challenge, KWS ground units have a massive uphill struggle to protect wildlife," the Tsavo Trust added.
"With today's mounting poaching pressures and anti-poaching resources stretched to the limit, it proved impossible to prevent the poachers getting through the net.