TYLER - Chandale Marie Harms and Derek Duane Johnson announce their engagement. Parents of the couple are Douglas Harms, Sr. and the late Patricia Harms of Sioux Falls, S.D., and Kevin and Marlene Johnson of Tyler. Harms is a 1999 graduate of Washington High School in Sioux Falls and Johnson is a 2002 graduate of RTR High School and a 2007 graduate of Dakota State University. Both are employed at Risk Administration Services in Sioux Falls where Derek works in information technology and Chandale in underwriting. An October wedding is planned in Sioux Falls.