1 EXHIBIT 23.06 CONSENT OF INDEPENDENT ACCOUNTANT We hereby consent to the incorporation by reference in this Registration Statement on Form S-4 of our report dated January 18, 2000 relating to the financial statements of Heritage Financial Services, Inc. appearing in Old National Bancorp's current Report on Form 8-K filed April 19, 2000. We also consent to the reference to us under the heading "Experts" in such Registration Statement. Heathcott & Mullaly, P.C. Brentwood, Tennessee April 28, 2000