but jack schumacher says he knows. >> this is where karen johnson was laying.n this doorway. >> reporter: how was she killed? >> choked, smothered, just bulldogged down by carl. >> reporter: jack schumacher says he knows that because carl pressley told him how it all went down that weekend. he also knows that bruce harkey wanted everyone in san saba to know that he was going out of town. jack vaughn, a local businessman, says he had only a nodding acquaintance with bruce harkey, and yet -- >> bruce started telling me how that he was going to be out of town all weekend long. stressed that "all weekend long." i'm leaving town early on saturday morning. i won't be back in till late sunday night. it might even be monday before i make it back in." he said, "i'm going to be gone all weekend long." >> reporter: by the time bruce harkey went on trial in april of 2014, his nephew carl pressley had confessed to his part in killing bonnie harkey and her caretaker. and carl's girlfriend, lillian king, had admitted her involvement. with the two of them set to testify agains