On Friday, April 12, 2019, Jeffrie Lynn Mattern, lost his short battle with cancer at the age of 57 years. Jef was born in McIntosh, SD, on January 6, 1962, the seventh child of Peter John and Gladys Marie (Lenerville) Mattern. Jef was raised in McIntosh and worked with his father at the Mobil Station. Jef graduated from McIntosh High School in 1980. He then attended Mitchell Vocational Technical School, from which he graduated in 1982.

In August of 1982, he moved to Spearfish, SD, where he began working for Wolff's Plumbing & Heating, a company of which he was a co-owner of at the time of his death. He took great pride in his work, and on-and-off over the years, his children worked alongside him.

In 1987, he married Jacqueline and the couple were blessed with two children before their union ended in 2003. They continued to raise their children in Spearfish.

Jef lived his life to the fullest, and he had a very active social life; many friends and neighbors will remember the parties hosted in his garage over the years. He was an avid hunter and fisherman, and an active member of the National Wild Turkey Federation. In his younger years, he was proud volunteer member of the Spearfish Volunteer Fire Department. One of his favorite places was Shadehill Lake, and many summers were enjoyed there with friends and family.

Jef is survived by his two children, Dusty Ryan and Allyx Emily; as well as their mother, Jacqueline; his long-time companion, Sheryl Swaby; her children, Jay Swaby, Jennifer (Adrian) Netterberg, and Joshua Swaby, as well has her grandchildren, Eli, Graham, and Dalton; his seven siblings, Caroline (Terry) Dauwen, Paulette (Butch) Fanning, John Mattern, Joel Mattern, Betty (Derry) Meyer, Marla (John) Hausauer, and Jerry Mattern, as well as 17 nieces and nephews, and countless other relatives and friends. Jef was preceded in death by his parents, Peter and Gladys Mattern; nephew, Dillon Meyer; great-nephew, Justin Fischer, brother-in-law, Jack Weekes and sister-in-law, Rhonda Mattern.

Visitation will be from 5-7 pm Wednesday, April 17, 2019 at Fidler-Isburg Funeral Chapel in Spearfish. Funeral services will be at 10:30 AM on Thursday, April 18, 2019 at Our Savior's Lutheran Church in Spearfish, with visitation one hour prior. In lieu of flowers, a memorial has been established.

Online condolences may be written at www.fidler-isburgfuneralchapels.com