Duane was born Oct. 23, 1948, in Le Mars, the son of Ervin and Sadie Lassen. He met his wife Kathy (of Boone, Iowa) at Iowa State University and they were married June 5, 1971. Duane received his Doctor of Veterinary Medicine from ISU in 1972 and, after serving in the Peace Corps in Tonga, he returned to ISU where he completed a residency in veterinary clinical pathology and obtained his Ph.D. He served on the faculty at Oregon State University for 14 years and had been on the faculty at Colorado State University since 1994 where he was a Professor in the Department of Microbiology, Immunology and Pathology and had served as Section Head of Clinical Pathology.
Duane had won the Carl J. Norden Distinguished Teaching Award three times at different universities.
Duane is survived by his mother, Sadie of Le Mars; four brothers, Gaylan and Bonnie Lassen of Remsen, Sherwin and Rhonda Lassen of Remsen, Arlo Lassen of Greensboro, N.C., and Delwyn and Belinda Lassen of Sioux Center; a sister, Twila and Ronnie Borchers of Akron; Kathy, his wife of 35 years; daughter, Erika Neyt and her husband Brian of Medford, Ore.; son, Jarrod "Jay" and his wife Kelly of Denver, Colo.; four grandchildren, who knew him as "Papa D", Hayden Duane Neyt, Brennen Joseph Neyt, Jonah Jay Lassen, and Aubrey JoAnn Lassen; and numerous nieces and nephews. Duane's daughter, Erika is expecting his fifth grandchild.
As per Duane's request, a casual memorial and celebration of his life will be held beginning at 2 p.m. Sunday, March 25, upstairs at the Rio Grand Mexican Restaurant, 143 West Mountain Ave. in Ft. Collins.
In lieu of gifts or flowers, Duane requested that any contributions be made to the College of Veterinary Medicine at Iowa State University, the Multiple Myeloma Foundation at the University of Arkansas Medical Center or the Northwest Nazarene University Athletic Department (where his son Jay played basketball), in care of Goes Funeral Care, 3665 Canal Drive, Suite E, Fort Collins, Colo. 80524.
Go online to goesfuneralcare.com to share a memory about Duane and/or to sign the guest book.