Berndt Dyresen Hedemark died on 18 June 1909 at the age of 57. Obituary from 1909-06-25 in Lyle Tribune states:

"B. D. Hedemark was born in Norway July 18, 1851 and came to America in 1873. He at once settled in Lyle and engaged in the shoe business, which he was pushed to success by his honest, energetic methods..."

Likely started around 1873-1875 as another article from 1900 says he has been "in town for twenty-five years"

1895-05-17 - B. D. Hedemark - W. L. Douglas $3 Shoe fit for a king.
1900-05-04 sketches of Lyle businesses - B. D. Hedemark "in town for twenty-five years". Boots and shoes.
1902-05-09 - There are no Shoes but B. D. Hedemarks Shoes. You Know Only of B. D. Hedemark, The Shoeman
1903-12-25 - Compare your Shoes with your neighbor's and you will see that HEDEMARK'S Shoes are better than all others. We dont' ask you to take our word for it. Come in and see for yourself. Hedemark, The Shoeist.
1909-06-18 - B. D. Hedemark dies
1910-02-11 - Herman Anderson, who has charge of the Hedemark Shoe Store, went to St. Peter, Sunday, for a couple days visit with his family.
1910-04-08 - Herman Anderson, who has had charge of the Hedemark shoe store for several months, has resigned his position and will leave as soon as some one can be secured to take his place.
1910-04-22 - Administrator's Sale $5000 stock of footwear. Lyle, Minn. In order to wind up our estate, I will close out the entire B. D. Hedemark Stock: Boots, Shoes, Ladies, Gents, Boys, Misses, Footware: Rubber Goods, Gloves, Polishes and Findings. This sales runs for 15 Days Only. Opens Friday April 22nd at 10 A.M.
1910-05-20 - A. L. Krause of Northfield has been secured to take charge of the Hedemark shoe store. Mr. Krause commenced upon his duties Thursday.