I knew personally the FO, feels silly saying Co pilot as he was a ultra experienced Captain 25000 hours plus, ex Us Airways A330 captain and ex Virgin America. He has flown so many types, last I heard from him he was on the MD80 and there is no one i would feel safer up there than him. RIP Ian a true family man and aviator until the end, see you down the road buddy.
Something must have gone bad and at very short notice, the rest of the flight looks normal. Prey to god it wasn’t low fuel, it seems on the base turn they powered up and there was nothing left to give .