Death by Return to Home. It's a shame the rock which blocked the signal also blocked the path home.

From http://www.diyphotography.net/drone-looses-contact-operator-activates-return-home-crashes-gopro4-rock/

The lens was damaged, good scratch on the bottom that was noticeable in later videos. Drone’s electronics were all fine, smashed up the arms and propellers which he has plenty of spares for. This isn’t his first time doing this, he did the same thing last winter and found the gopro a few months later still in perfect condition without the case. He has the video on his page, it’s pretty cool

Any drone pilot worth his/her salt has done this a few times. Geography is a harsh mistress: don't lose line of sight!

A scratch on the lens is hardly "destroyed".

I'm continually amazed at the toughness of those little cameras!

All that was required was for the RTH to climb 20 metres first and it would've been fine!

Don't some drones retrace their steps instead of drawing a straight line from current position to the initial GPS coordinates? Even a customisable minimum altitude for RTH would be enough in many cases.

It still records. Haha! Love the music used!

Customizable RTL altitudes are pretty standard, but, in this case, the pilot would have needed to know the altitude of the pinnacle (relative to the takeoff point) and program it in before the flight. Not very practical. The "breadcrumb" style of RTL: following manually recorded waypoints back home is great, and would have saved this drone, but most firmwares don't support it.

LOLd. Well done soundtrack...