DID A PHOTOGRAPHER, ALREADY ON DEATH ROW FOR THE MURDERS OF TWO YOUNG ASPIRING MODELS, KILL MORE WOMEN? AND IF SO, HOW MANY? JIM AVILA REPORTS

Airing On �20/20,� Friday, August 18 on ABC

Also: The Aids Epidemic In Africa And The Kids Left Behind: Deborah Roberts Reports; Twin Babies Born Needing Heart Transplant: An Update; John Stossel�s �Give Me A Break�

Row after row of pictures of pretty young women taken in the late 1970�s and early 1980�s line a poster created by the Los Angeles County Sheriff�s Department � pictures taken by William Richard Bradford, a photographer who liked to focus on young women who aspired to be models. It took police years to discover that his pictures might hold clues to unsolved murders. As Jim Avila reports, Bradford, has been on death row in San Quentin since 1987 for murdering two young women, and based on what he muttered to the jury upon conviction, many believe he is responsible for more. Bradford faced the jury box and said �think of how many you don't even know about." That is why 22 years after the murders of Shari Miller and Tracey Campbell, the chilling poster of 47 pictures from Bradford�s collection found in a shoebox during his arrest is being used as a tool to find possible victims. �I want to be able to point to every picture on there and say who she is and what her life is. In other words is she alive. And if some of these women were in fact homicide victims I want to be able to investigate those cases as thoroughly as we possibly can,� said Captain Ray Peavy of the Los Angeles County Sheriff�s department. �20/20� airs on FRIDAY, AUGUST 18 (10:00 p.m., ET) on the ABC Television Network.

Also: �20/20� journeys to Namibia, Africa, where tens of millions of people have been wiped out by the modern day plague of AIDS. Deborah Roberts� reporting focuses on the children left behind, some as orphans heading up households struggling to raise themselves and their younger siblings the best they can with virtually no food or money.

Plus: In April, �20/20� first reported on the emotional story of twin baby boys in need of heart transplants to survive. The newsmagazine was there as baby Nicolas Draper received the rare infant organ transplant, but brother Nathanial still was waiting for the gift of life. Elizabeth Vargas updates the report this week with a miraculous turn of events. The report includes exclusive access to be with the Draper family while they waited for the donor heart, while they waited the results of the surgery, and when something unusual happened � they met the donor family and the donor family met the recipient of their son�s heart.

And: John Stossel�s �Give Me A Break� -- How many summer pleasures like diving boards and swimming holes have we as a society lost because people are afraid of being sued? Stossel reports that many kids may fall and hurt themselves swimming or climbing trees, but questions if we are happier� or safer living in a society where they are not even given the chance to try.

�20/20� is anchored by Elizabeth Vargas and John Stossel. David Sloan is the executive producer.