Dianne Kossman

Dianne C. Kossman a longtime Prosser resident, passed away on October 27, 2026.

Dianne Cecilia Mousseau was born March 1st, 1943, in Spokane, WA to Ralph and Hattie (Faford) Mousseau.

She graduated from Boise High in 1962. Shortly after graduation, she met and married the love of her life Deloy Kossman on September 1st, 1963.

She worked at Twin City Foods for many years in the quality control department, before pursuing a dream of owning a ladies clothing boutique. After closing the boutique to enjoy retirement life with Deloy, time was spent gardening, home remodeling projects and being with family. The simple life at home together was all they needed.

Dianne is survived by four children, Tony (Theresa) Kossman-HI, Penny (Rich) Main, DeeDee (Howard) Swanson and Danny (Michelle) Kossman all of Prosser, 14 grandkids and 22 great grandkids, brother Walt Mousseau and sister Dorothy Broadie, and many nieces and nephews. She is preceded in death by her husband Deloy, her parents and sister Evelyn.

There will be a public viewing at Brookside Funeral Home (1220 Sheridan Ave, Prosser, WA) on Monday, November 9th from 12:00-2:00pm. A Graveside Service will be held Tuesday, November 10th at 1:00pm at Prosser Cemetery.