Karmen Smith was Nick Smith's mother and Lottie Spencer's friend and roommate. Seventeen years after the attack in which she was killed and Nick Smith was stabbed 18 times, Nick Smith and Spencer said they can finally start living their lives. Last month, Waseem Daker was convicted of murdering Karmen Smith and nearly killing her son when he was just 5 years old in the 1995 attack. Watch their first-ever interviews on "20/20," Friday at 10 p.m. ET.