What started as a workplace dispute at an Irvine industrial plant, culminating with an alleged attack on a co-worker, led to insurance fraud charges for a 65-year-old Lake Forest man, a prosecutor said Tuesday. Randal Brown McKay was arrested Feb. 1 on charges stemming from the fracas with a co-worker in June 2014. McKay, who posted $25,000 bail, is scheduled to be arraigned Wednesday. McKay had “a habit of being a difficult and angry person” with his former co-workers, Senior Deputy District Attorney Pamela Leitao said. “He’s been known to throw things at other employees.”