From ABC News Headquarters in New York City, this is GMA3.

All we want for Christmas is you, America.

And I'm Mike here with Rebecca.

We're glad you can join us on this Tuesday.

Yes, we are.

And if you want to work off all those holiday treats, well, we're going to help you kickstart your New Year's resolutions with superstar Peloton instructors, Robin Arzone, and Jess Sims, who are here to show us how to train like a pro. And you can do it from home. And you can do it from right here in the studio, right?

Yes, you can.

We see. Also, we're going to hear from Anthony Geary's

longtime General Hospital co-star Jeannie Francis. Of course, Luke and Laura, who is such an iconic

doing. We'll have that coming up. We're going to start with the latest in the murders that

stunned Hollywood and movie fans across the country. One of the sons of Rob and Michelle Reiner

is behind bars suspected of killing his parents.

Trevor all joins us from Los Angeles. Hey Trevor. Hey there, Ike. So Nick Reiner's being held here

in downtown L.A. in jail suspected of the murders of both Rob and Michelle Reiner. And we're learning

some critical new details about the night leading up to those murders, including Nick's behavior at a holiday party.

32-year-old Nick Reiner is locked in jail without bail, suspected of murdering his parents.

Iconic filmmaker Rob Reiner and his wife, Michelle, were found dead Sunday inside their Los Angeles home,

and we're learning new details about the hours leading up to their deaths.

Sources say Saturday Rob Reiner and his son Nick got into an argument at Conan O'Brien's holiday party.

Nick was seen there acting strangely. Sunday law enforcement sources say the couple's daughter found them with fatal stab wounds.

Reiner's friends, comedian Billy Crystal and Larry David, came to the house soon after,

police closing down the neighborhood to investigate.

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