Austin , Texas ( CNN ) -- The former accountant for Andrew Joseph `` Joe '' Stack III -- who officials say flew his plane into a Texas building housing an Internal Revenue Service office -- says Stack had never threatened him , a spokesman for the accountant said . CPA Bill Ross was mentioned in a 3,000-word message on a Web site registered to Stack , which railed against the government , particularly the IRS . The online message believed to have been written by Stack criticizes accountant Ross for `` representing himself and not me . '' Ross had not heard from Stack since October , when his client `` disengaged '' services in a letter , spokesman Chad Wilbanks told CNN . According to Ross , Stack had not expressed any threats toward the accountant or the IRS , Wilbanks said . `` Mr. Stack contacted my firm to help with his personal taxes in 2008 . He failed to provide me with all his income and other information resulting in an IRS audit , '' Ross said in a written statement Saturday . `` Unfortunately , Mr. Stack ignored the audit and my advice which only complicated his situation , at which time our firm disengaged our services with Mr. Stack whom we have not been in contact with since October 2009 . '' Ross did not provide any further details in the statement on his work with Stack . Wilbanks said Ross , who has worked as a CPA for at least 30 years , thinks Stack located him in the phone book . They only met four times and did not have a personal relationship , Wilbanks said . The FBI has taken over the investigation into the crash , and Ross has spoken to investigators , Wilbanks said . While Ross does not fear for his safety , he has `` taken precautions , '' though those steps were not detailed by Wilbanks . The online message , in a hit to the IRS , states , `` I saw it written once that the definition of insanity is repeating the same process over and over and expecting the outcome to suddenly be different . `` I am finally ready to stop this insanity . Well , Mr. Big Brother IRS man , let 's try something different ; take my pound of flesh and sleep well . '' Read the apparent suicide note ( PDF ) The seven-story building attacked in northwest Austin held offices for nearly 200 IRS workers . Two people were killed and two others were hospitalized when Stacks crashed his plane into the building Thursday , federal officials said . One of the injured , Shane Hill , announced his release from the hospital Saturday . `` I am very grateful to the first responders who were there to assist me , and to those who have cared for me in San Antonio , '' Hill said in a written statement . `` I am so blessed to be home today , and I ask for your courtesy and our privacy as my family and I focus on making a quick and full recovery . '' Though the remains of two people found in the IRS building have been identified , their identities will not be revealed until after a forensic examination , said Ralph Diaz , special agent in charge of the FBI 's San Antonio field office . Watch one of crash victim 's sons say he 's `` still a little shocked '' Agents were looking into whether the seats of the plane were removed to accommodate a fuel drum in an effort to cause maximum damage , an official familiar with the investigation said Friday . The official , who could not speak on the record because of the ongoing investigation , said the Piper Cherokee PA-28 had several seats removed and a fuel drum was missing from the airport Stack took off from . The single-engine plane has a fuel tank capacity of 38 gallons and is equipped with four seats , according to the Web site risingup.com . Authorities say Stack also torched his $ 230,000 home in Austin on Thursday morning before embarking on his fatal flight . Stack 's wife , Sheryl Stack , expressed her `` sincere sympathy to the victims and their families '' in a statement read by family friend Rayford Walker on Friday . Like Ross , friends and former colleagues said they had no inkling of the rage apparently building inside Stack . `` He hid that very well , '' said Billy Eli , in whose band Stack played bass until a few years ago . `` Obviously he was in some serious distress and had some real despair . I never saw that . '' CNN 's Tracy Sabo contributed to this report .
CPA met Andrew Joseph ` ` ' '' Stack III only four times , spokesman says . The online forum criticized ' Ross for ` ` to himself and not me '' Ross had not heard from Stack since October , when his client ` ` disengaged '' services in a letter . One of the victims , Shane Hill , announced his hospital ##ization Saturday : ` ` I am very grateful ''