When a female Sumatran rhino was captured in a pit trap in March in the Indonesian part of Borneo, the conservation community cheered. The endangered species had not been physically encountered in the area for 40 years. But now that hopeful story has taken a sad turn, as the rhino—known as Najaq—has died.

"Our hearts are saddened by this devastating news from Kalimantan," the International Rhino Foundation wrote on its Facebook page Tuesday.

Najaq succumbed to a leg infection after her health deteriorated over the past few days, Indonesia's environment minister said. Further investigations are pending. 

According to Arnold Sitompul, conservation director of WWF-Indonesia, early evidence suggest the infection was first caused by a snare from an earlier poaching attempt, before the animal