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SHAMELESS ON "20/20 SATURDAY" AIRING APRIL 12, ON ABC

With reports on an internet Casanova, insurance scammers, and squatters, "20/20" examines wide ranging behavior that some call shameless. "20/20 Saturday" airs on SATURDAY, APRIL 12 (9:00-10:00 p.m., ET) on the ABC Television Network. Anchored by Barbara Walters, reports include:

· Internet Casanova: He is accused of being a one man wrecking crew; a man who found women and sometimes professed his love. One after another, he allegedly mooched off them for homes, food, clothes, sometimes even sex, not only breaking hearts, but sometimes tapping their bank accounts. But just when Ray Holycross thought he had perfected his Internet Casanova routine, he met his match. Amy Robach with a cautionary tale of reality in the age of internet dating. (OAD: 4/12/13)

· Warrior Eli: They were a beautiful but tragic family; J.S. Dirr, the Canadian Mountie dad; the fetching wife and mother, who died suddenly in a car crash; and three-year-old "Warrior Eli," named for his valiant fight against cancer. For years, people had followed the family's ups and downs on the internet, forming relationships with the father, wearing wristbands in Eli's honor, and donating money for cancer research in Eli's name. But when one online "friend" became suspicious and started sleuthing, the whole family was revealed to be a figment of one woman's imagination. Elizabeth Vargas reports. (OAD: 1/11/13)

· Squatters: Dan Harris follows the story of Andre Barbosa, the man who took over a multi-million dollar foreclosed home on the water in Boca Raton, Florida making headlines nationwide. Using an obscure law called "Adverse Possession," Barbosa was able to hold prosecutors and police at bay for weeks while frustrated neighbors tried to have him evicted. Barbosa is a member of a group called Divine Province led by James McBride. Harris has a rare interview with McBride. (OAD: 4/12/13)

· Workers' Comp: "20/20" investigates people out to make a quick buck by faking injuries in order to collect disability payments. Private Investigator John Hakala shows Cecilia Vega how these alleged con artists are often busted by surveillance cameras. (OAD: 4/12/13)

· Ridiculous Write-Offs: The stripper who wrote off her breast implants� the lawyer who thought he could write off as a medical expense the $65,000 he spent on prostitutes� "20/20" reports on some imaginative deductions. Paula Faris reports. (OAD: 4/12/13)

David Sloan is senior executive producer of "20/20".