Tune in to FOX News Channel this Saturday at 10 p.m. and 1 a.m. and Sunday from 10 p.m. to 12 a.m., 1 a.m. ET as award-winning and veteran journalist Geraldo Rivera brings you two special broadcasts this weekend!

Saturday, August 27

A stunning new development in the search for Natalee Holloway (search)! Why have authorities in Aruba re-arrested both Satish and Deepak Kalpoe (search) along with another friend of Joran van der Sloot (search)? And who is this mystery friend? We’ll have complete coverage of this breaking story with Beth Holloway Twitty and her attorney, Helen Lejuez.

Then, Geraldo uncovers more disturbing shenanigans in convicted sex offender Joseph Duncan's (search) lurid background. Victoria Santiago and her son tell Geraldo how he narrowly escaped abduction just days before Duncan targeted siblings Shasta and Dylan Groene (search). And, we’ll play the 911 tape to cops that potentially could have saved little Dylan’s life at the hands of this brutal killer.

Plus, was a big-time music producer the victim of a Nigerian Internet fraud scheme gone bad, or did an unknown medical problem cause him to flee from his Los Angeles house in the dead of night in fear of his life? Tonight, we’ll bring you the mysterious circumstances surrounding the disturbing disappearance of 3-time Grammy nominee Christian Julian Irwin (search). Will his A-list celeb friends, including Queen Latifah, (search) De La Sol, Carly Simon, (search) David Bowie and Vanessa Williams, (search) help out in the search? Irwin’s sister, Sharon Riolo, joins Geraldo as family, friends, cops, even the Secret Service, desperately work to solve this missing person’s case.

And, Hurricane Katrina (search) makes a deadly path across southern Florida. Where will she make landfall next? Keep it here to track Katrina’s chaos all weekend long!

Also, the Rev. Al Sharpton plans to join Peace Mom Cindy Sheehan (search) in a prayer vigil outside of President Bush's ranch in Crawford, Texas. Sheehan’s well-publicized protest at Camp Casey, named after her 24-year-old son, Army Spc. Casey Sheehan (search) who was killed last year in Iraq, has encouraged anti-war activists to join her and prompted peace vigils nationwide. Are Sharpton and Sheehan an unlikely duo? Don’t miss the fireworks when he joins Deborah John of "You Don't Speak for Me Cindy" (search) in an “At Large” debate.

Sunday, August 28

We’ll talk to General Wesley Clark (search) about all things Iraq. Plus, what does he think about Peace Mom Cindy Sheehan (search)? Find out tonight!

And, we’ll have an update on missing Missouri model Julie Popovich (search). As homicide detectives focus their energy on identifying and interviewing everyone who was inside a bar the night Julie disappeared, friends and family continue their desperate search for the Ohio State University co-ed. Crime Stoppers' (search) Kevin Miles and Julie’s friend, Tiffany Maynard, join Geraldo.

Then, “At Large” launches and investigation inside the new sex charges against Joran van der Sloot (search). You won’t believe what we find out! Plus, Beth Holloway Twitty and Diario’s Jossy Mansur will be here for the latest breaking news in this constantly developing story.

Plus, "O'Reilly Factor" host Bill O’Reilly has something to say! From the Holloway media coverage to illegal immigration – it’s Bill and Geraldo as you’ve never seen them before.

And, Rivera packs a punch in the boxing ring! Don't miss it!

Plus, we’re live and around the world with the very latest in the war on terror.

These stories and much more!

Real journalism: fair and balanced. That's why we're No. 1 — FOX News Channel.

NOTE: The Associated Press contributed to this report. Topics and guests subject to change.