Jack Burch III was in the custody of federal pre-trial service employees when he disappeared Monday.He had been taken to a health care facility in downtown Portland to receive a medical evaluation, but he walked away from the facility at about 12:30 p.m.Burch is suspected of a robbery at the Bank of America in Gresham on Jan. 17. He was apprehended one block away from the bank they believed he robbed. If they hadn’t apprehended him, police said a personalized demand note with his name and address on it would have helped in his arrest.According to police, they found a note demanding money that was signed with Burch’s full name and complete address, including apartment number and zip code.Burch is described as white, 6 feet 1 inches tall, 120 pounds with short brown hair and hazel eyes. He wears glasses, officials said.