Sadly, despite being treated for gunshot wounds, Diana died seven months later from an infection related to her injuries.
There are only about 750 black rhinos left in Zimbabwe, and though poaching there has fallen slightly in recent years (thanks to conservation efforts), the species' numbers are down dramatically from historic levels. Elsewhere, however, poaching rates continue to soar.
In South Africa, home to the largest number of African rhinos, 1,215 of the animals were killed in 2014 - a 21 percent increase over the previous record high set just the year before.
Visit Save the Rhino International to learn how you can help.