Sunnyvale Public Safety Department Officer Edward J. Roth, 44, was killed fighting a fire in “Silicon Valley” when a roof collapsed and he fell into the burning building.

Roth was one of a five-man crew fighting the three-alarm fire on the roof of the General Technology Co. building.

Roth, who was married and had two children, had been with the Public Safety Department for 15 years, working both as a policeman and fireman in the department in which employees rotate between police and fire assignments and often double on them.

Cause of the fire, which broke out at 10:45 a.m. is under investigation. Officer Gale Bate said the building was sued for assembling printed circuits and did not involve some of the exotic chemicals found in other blazes in the industry.

The fire was brought under control in 45 minutes by 40 firefighters.