Karnatz was out for her daily run when she was murdered on the Neuse River Greenway Trail last week.
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She was a longtime member of North Carolina Roadrunners Club and Saturday morning they held an observance at their 10-miler and 4-miler event at American Tobacco Trail in Apex.
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A celebration of life service will be held for Karnatz on Sunday at 2 p.m. at North Raleigh Presbyterian Church on Strickland Road.