Brenda Breslauer

Nima's lawyer addressed the knife in his closings as well. How did he counter the prosecution's story that it was in Nima's possession?

Nima's lawyer addressed the knife in his closings as well. How did he counter the prosecution's story that it was in Nima's possession?

So what did the defense say about how the knife got to the crime scene then?

So what did the defense say about how the knife got to the crime scene then?

Oh, interesting. Okay. This jury has a lot of evidence to go through, and the judge has given them some pretty clear instructions on the charges.

Oh, interesting. Okay. This jury has a lot of evidence to go through, and the judge has given them some pretty clear instructions on the charges.

I guess it's anyone's guess how long it'll take to reach a verdict.

I guess it's anyone's guess how long it'll take to reach a verdict.

Next up, when a wealthy businessman and his family were brutally murdered at their home six years ago, questions swirled about a possible hit for hire until police arrested the man's brother. We've got the latest from the courtroom.

Next up, when a wealthy businessman and his family were brutally murdered at their home six years ago, questions swirled about a possible hit for hire until police arrested the man's brother. We've got the latest from the courtroom.

For our next story, we're heading to a New Jersey courtroom where a judge is weighing whether a prosecutor can use cutting-edge science in a disturbing quadruple murder case. In November 2018, just a few days before Thanksgiving, two fires broke out at the homes of two brothers, Paul and Keith Canaro. Paul and his family got out alive, but his brother Keith was not so lucky.

For our next story, we're heading to a New Jersey courtroom where a judge is weighing whether a prosecutor can use cutting-edge science in a disturbing quadruple murder case. In November 2018, just a few days before Thanksgiving, two fires broke out at the homes of two brothers, Paul and Keith Canaro. Paul and his family got out alive, but his brother Keith was not so lucky.

When first responders got to his house, they discovered that Keith had died, but not in the fire. He'd been shot repeatedly. His wife and two children were also dead.

When first responders got to his house, they discovered that Keith had died, but not in the fire. He'd been shot repeatedly. His wife and two children were also dead.

Tonight, an outpouring of grief for a family police say was targeted and murdered in their own home.

Tonight, an outpouring of grief for a family police say was targeted and murdered in their own home.

But by whom? A week later, investigators came up with a stunning theory. Paul Canero had killed his brother and his family and then set fire not only to his brother's house, but to his own to cover up the crime. He was charged with their murders and two counts of arson.

But by whom? A week later, investigators came up with a stunning theory. Paul Canero had killed his brother and his family and then set fire not only to his brother's house, but to his own to cover up the crime. He was charged with their murders and two counts of arson.

Producer Brenda Breslauer, who has been covering the case for Dateline, is here to tell us what prosecutors believe is Paul's motive and why science is now taking center stage in the courtroom. Hey, Brenda. Hi, Andrea. So, first of all, very interesting that this involves two brothers. What do we know about them, the Caneros, and their relationship?

Producer Brenda Breslauer, who has been covering the case for Dateline, is here to tell us what prosecutors believe is Paul's motive and why science is now taking center stage in the courtroom. Hey, Brenda. Hi, Andrea. So, first of all, very interesting that this involves two brothers. What do we know about them, the Caneros, and their relationship?