Blake Sieker, managing partner at Context Network LLC, passed away unexpectedly Jan. 14 at his home in Castle Pines Village, Colo., the West Des Moines-based agribusiness management consulting firm said. He was 51. Sieker joined the firm in 1998 and had served as its managing partner since 2006. Prior to joining Context Network, Sieker was chief financial officer and treasurer of Midwest Seed Genetics Inc., strategy manager for Zeneca AgroBusiness Group, UK, and controller for Garst Seed Co.