Former Timber Lake teacher and coach Mark Senftner, who has been the football and girls basketball coach at Sully Buttes (Onida) for the past 14 years and is one of the winningest prep coaches in South Dakota, is stepping down to battle a new, lifethreatening opponent.
A native of McLaughlin, Senftner was diagnosed in late November with a brain tumor that was discovered after he was accidentally…
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