By CBS Bay Area One year after a deadly apartment fire in San Rafael killed two women and two cats, the investigation into what happened remains ongoing, with the victims’ families still waiting for answers. The fire at 516 Canal St. was determined to be arson. But one year later, no one has been identified as responsible. Tracey Lowmiller’s partner, Chris Dadar, met for an interview at a baseball field in San Rafael, a fitting place, he said, b…