A suspected bank robber who made a double bomb threat that virtually shutdown downtown Monterey on Sept. 26 was identified as a senior citizen. Sergio Valderrama is 78 years old and lives in Greenfield. He burst into Bank of America at 200 East Franklin St. in Monterey with a gun and ordered bank tellers to fill a briefcase with cash, according to police. Valderrama ran out with $20,000, police said.