when he broke in through the back door, he woke the homeowner, dorothy donovan. cannon was afraid she'd be able to identify him. so he used the screwdriver he took from charles' truck and stabbed charles' mother to death in a drug-fueled rage. he left his palmprint and dna inside the home. charles saw him on the property and called police, convinced that cannon had somehow followed him. cannon claims it was just a coincidence that he chose dorothy's house. he was unaware of any connection between dorothy and charles. >> investigators asked him if anyone else was with him, if he knew charles holden, did anyone ask him to do it? and his response to investigators was, no, that he acted alone. >> when they told cannon that charles was my mother's son, he was totally surprised. that was such a relief to us. that showed us that charles was not connected with him. >> in the face of a possible death sentence, gilbert cannon pleaded guilty to first-degree murder and was sentenced to life without parole. the science proved not only that gilbert cannon was guilty, but that