"Tanzi said he was "very comfortable" that authorities have the right man. "We're positive; we have eyewitnesses who have identified him," he said, adding that Rodriguez will be facing other charges as well.

Tanzi said other employees of the architectural and engineering firm where the attack occurred have described Rodriguez as a "disgruntled former employee."

A company spokesman said Rodriguez had been let go from the company two years ago for "performance issues."

Ken Jacobson, the chief financial off