Deborah Pfingston's son Andrew Ashcraft, 29, was one of 19 firefighters killed fighting wildfires in Arizona.
She paid a moving tribute to him, saying he 'lived and breathed' his work.
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Singer posted on Facebook that she had taken an overdose and hidden in a hotel.
After decades of struggling negotiations both activists and delegates are hoping for some form of landmark agreement.
World Rugby chairman Bernard Lapasset led the tributes, calling Lomu 'a giant' of the game.