Investigators may have identified someone as a suspect in an unsolved 1979 sexual assault and killing, and they are renewing a call for the public’s help in a second unsolved case involving a woman who disappeared in 1999, officials said.

The Alamance County Sheriff’s Office is seeking fresh input from the public in the 1979 death of Tammy Sue Aldridge, 20, after developing a possible suspect, Sgt. Dan Denton said.