Kenneth and Jacquelyn Johnson stand next to a banner on their SUV showing their late son Kendrick, in Valdosta, Ga., in December 2013. A family spokesperson told NPR they are “cautiously optimistic” after the Lowndes County Sheriff’s Office reopened its investigation last week.

FILE- In this Dec. 13, 2013 file photo, Kenneth and Jacquelyn Johnson stand next to a banner on their SUV showing their late son, Kendrick Johnson in Valdosta, Ga. The parents of Kendrick Johnson, who was found dead inside a rolled-up gym mat at school, have dropped a wrongful death lawsuit accusing two brothers of killing their son. Chevene King, the Johnsons’ attorney, told The Valdosta Daily Times, Tuesday, March 1, 2016, the family eventually plans to refile the lawsuit. (AP Photo/Russ Bynum, File)