Mr Watanabe worked as a construction foreman on the Forth Rail Bridge.

BBC: NEWS | UK | Scotland | Glasgow, Lanarkshire and West | Rail bridge builder on ?20 notes

In one 911 call, a panicked construction worker reported that the foreman at his business had been shot and one of the company's trucks stolen.

NPR: Official: Calif. Gunman Was Loner, 'Gamer'