DID A MAN FAKE HIS OWN DROWNING AND DISAPPEAR?

Also: A Husband Vanishes Into Thin Air, Leaving a Family to Wonder� What Secrets Was He Hiding?

"Primetime: Family Secrets" Airs Tonight, Tuesday, July 13 on ABC

Matt Sheppard appeared to have a good life - a loving wife and daughter and a well paying job. But after the Arkansas man disappeared in a lake during a family vacation, police began to suspect foul play. Did Sheppard stage his own drowning death, and how much, if anything, did his wife -- who would collect a large life insurance payout -- know about his plan? Jim Avila reports on "Primetime: Family Secrets," tonight, TUESDAY, JULY 13 (10:01-11:00 p.m., ET) on the ABC Television Network.

Plus: On his way home from work one winter night to bake cookies with his kids, family man Nicholas Francisco mysteriously disappeared. As friends, family and co-workers mobilized to search for him, questions began to swirl about Nicholas' secret life. A police investigation soon revealed surprises that would stun the community. Elizabeth Vargas reports.

David Sloan is executive producer of "Primetime: Family Secrets."