arrestees. >> reporter: two years ago, detectives ran the killer's dna searching for a link. no match. then a break. they entered a dna of a man convicted of a felony weapons charge. his name was christopher franklin. months later, they ran the grim sleeper's killer's dna hoping for a match to a family member. they got it. detectives zeroed in on christopher franklin's father, 57-year-old lonnie david franklin, who lived in south los angeles within walking distance to one of the victims, 18-year-old alisha monique alexander. at one time, the man described as a polite neighbor even worked as a garage attendant for los angeles police. detectives were confident they found their man but before they could close in, they would need a sample of his dna. with franklin under surveillance, they picked up a piece of uneaten pizza crust along with some eating utensils. police sent it all to the lab. soon after, they say, they had a