Twenty years have passed since the body of 74-year-old Lela Mae Adcock was found inside her apartment on Rebel Hill Street, her throat cut.“It bothers me so much that someone would do that to her,” said her son, Paul Adcock, reflecting back on the unsolved murder of his mother. “It’s been 20 years. Maybe someone would be willing to come forward now that so much time has passed and let us know what happened and why.”Ms. Adcock was found by a policeman who was conducting a welfare check at her McMinnville Housing Authority residence after she did not answer phone calls from relatives.