Upstate man credited with helping identify John and Jane Doe in Sumter County Matthew McDaniel is a volunteer with a passion of representing the voiceless. He now has his sights on a new non-profit to further his mission. Author: Alicia Neaves Updated: 11:24 PM EST January 21, 2021 SUMTER COUNTY, S.C. — An upstate man is being credited for helping learn the identities of John and Jane Doe in Sumter County after 44 years. Victim's Advocate Volunteer Matthew McDaniel is from Clemson, SC. He works on his own time digging into missing persons and unidentified persons cases from around the nation. For the last eight years, he's worked with the Sumter County Sheriff's Office to track down leads in a mystery Sumter double murder case from 1976.