Cote said he left the company after about six months to study sports medicine.
Another Benjamin Moore Paint truck driver, Sergey Sizmin, told The Columbian newspaper he has worked for the company for seven years.
"I'm so shocked," Sizmin said. "Everybody's friendly, everybody here works nicely together."
Vancouver is near Portland, Ore., on the north bank of the Columbia River. It's the fourth-largest city in Washington, with a population of more than 161,000.
Kendra Abdich, 24, said she heard two loud bangs at about 11:30 a.m.
Abdich, who lives one block from the office park, said workers often load and unload trucks at the businesses, and sudden, loud noises aren't unusual.
But Abdich said she soon saw several police cars "flying by," and checked her computer. She saw news reports and realized she lived about 100 yards from the scene.
"It's not normal out here," Abdich said. "It's a little scary."
Associated Press writers Donna Blankinship and Phuong Le in Seattle contributed to this report.