Donald J. Clark, 84, of Great Falls, passed away of Alzheimers on Monday, July 20, 2015.At Donalds request, no services are planned.Donald is survived by his wife, Beverly; son Patrick Clark of Newport, OR; daughters Katy Gayles of Eugene, OR and Dena Levine of Seattle, WA; four grandchildren; and seven great-grandchildren.He was preceded in death by his son, Christopher.