The video below has gone viral since being posted to Facebook by Steven Stubenrauch last weekend.
In the video a zookeeper punches a kangaroo in the face after it put his dog in a headlock.
The video has now been viewed over 4 million times.
An Austalian news website has revealed that the incident happened when a small group of friends organised a final hunting trip for a young man, Kailem, with cancer.
They report that the 19-year-old passed away last week.
The friends filmed the trip and put together a DVD for his family and that DVD contained the minute of footage that has since gone viral.
Kailem lost his battle with Ewing Sarcoma on Thursday December 1. He married his girlfriend in a bedside ceremony on November 27, you can watch the video below.
Kailem & Brandi-Lee from Erin Easey Photography on Vimeo.
Read more about Kailem here.