Witnesses say Taptejdeep Singh was killed in the VTA mass shooting in San Jose trying to save those around him and warned colleagues arriving at work to stay away or hide from the gunman.
Sam Cassidy, 57, shot dead nine co-workers on Wednesday in San Jose
Cassidy filled his home with an arsenal including 25,000 rounds of ammunition
He also had home-made bombs inside, and lit a fire to try and blow up his home
The house failed to explode but did catch fire; the bombs were deactivated
Cassidy killed himself when police closed in on him at the end of his rampage
A picture is emerging of a deeply disturbed man with a long hatred of his job