was 46-year-old calvin powell, and he was well known to police. >> he's a colorful character. he's got several minor arrests, i believe there are some felonies for drugs or for, you know, property crimes. >> powell insisted he had nothing to do with rice's murder, but he could offer no alibi. he told investigators that 19-year-old william buck sometimes slept in his apartment and said that buck owned a weapon. >> what he told us was that in the past buck had assaulted him with a .380-caliber semiautomatic handgun. we knew that was the caliber or size of the weapon that was used to shoot and kill kevin rice. >> and there was another coincidence. the asthma inhaler found near the crime scene was traced by its lot number to william buck's doctor. >> william buck was a patient at this clinic and actually had been prescribed the precise type