Nissen initially believed he was OK but a short time later during his shift he began to feel ill. He was taken to a local hospital the following day where it was discovered he had suffered a concussion, which resulted in several surgeries. He suffered a serious complication during one of the surgeries, which resulted in him becoming a paraplegic and unable to speak. He died as a result of his injuries on March 12, the Officer Down Memorial Page reports.
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