From Charley Project there was a suspect
Sigmon-Palmer's loved ones describe her as friendly and outgoing, and one of her friends stated she had a naive, trusting nature. She had work experience in nursing homes and a a secretary and file clerk, and she had previously lived in Oklahoma City, Oklahoma, Seaside Park, New Jersey, and several small cities in Pennsylvania. She had no prior criminal record, and investigators don't believe she was responsible for Farley's murder. She did, however, associate with people who were in motorcycle gangs and involved with drugs.
Mark Legg is considered a person of interest in Farley's murder and Sigmon-Palmer's disappearance. He is a former West Virginia resident and has been a suspect and a person of interest in several unrelated crimes in West Virginia and North Carolina between 1983 and 2000, including sexual offenses against two teenage boys and the murder of two young men, but each time he was either not charged or the charges were dropped. Authorities have not been able to tie him to Farley and Sigmon-Palmer's cases, however.
Many members of the couple's families, including Farley's father and both of Sigmon-Palmer's parents, have died in the years since 1979. Foul play is suspected in her case, which remains unsolved.