Prosecutors turned their attention to Justin's possible motives, and called Shannon Kennedy to the stand. She testified that she didn't originally know Justin was married but that once she found out, he told her, "He said that he loved her, he just couldn't live with her."
"If you want to look at just the fact that he was cheating on his wife, and the fact that there was two million dollars, and you want to stop right there, then we can't do anything about that. If on the other hand, you're really seriously interested in who killed April Barber, let's look at the evidence," defense attorney Willis argued.
"That's exactly what prosecutors did next, when they dropped a bombshell. Six months before the murder, they say, Justin went online to research how to shoot himself without getting hurt. A computer expert recovered a record of those Google searches.
Then, just hours before April was murdered, Justin went online again. The expert testified Justin downloaded an mp3 of the Guns N' Roses tune, "Used To Love Her," which includes the lyrics, "I used to love her but I had to kill her."
Asked how significant that song was in this case, prosecutor Foxman tells Dow, "Well, it was significant because of the timing. Downloaded just hours before the murder. Then, when he set to turn his computer over to law enforcement after the murder, that was the only song deleted."
Justin surfed the Internet so often, his lawyer says, the evidence is meaningless.
"Out of potentially 2,200 queries, they wind up with two that look bad in retrospect. I think I could probably do that on anybody's computer," Willis says.
And Justin says he's not giving up. "I will fight until I have no more options," he says.
As Justin's murder trial dragged into a second week, the pressure was growing on two families who once were close.
"This is devastating for us. And it's devastating for them," Amber says.
It's particularly tough on April's siblings, Julie and Kendon, whom Justin once helped raise.
"It was heartbreaking, because somebody that we had trusted and somebody that we had loved would be capable of doing something like that to our sister. We both looked up to him," Julie says.
The defense attacked one of the most critical points in the case: whether Justin's wounds were superficial or not. A defense expert testified that Justin's wounds were serious and that one nearly struck an artery.
Then prosecutors presented two witnesses who say they saw another car at the crime scene. The problem is, they can't agree what color the car was.
The trial finally boiled down to a key point, illustrated by a graphic, which represented a crime scene photo of April's face that the jury was shown.
To prosecutors, the blood flowing in a single direction proved Justin was lying.
"The blood flow is everything. Justin Barber's story is that she was shot down by the water and then carried 18 different positions with her head moving in all kinds of directions. The blood flow would be everywhere. Instead, it's in a unified direction. And, what the significance of that is, his story just wasn't true."
But the defense's expert testifies the blood flow is consistent with Justin's story.
"In my view, she was shot in that location near the water, and other blood which had come out was probably washed away by the waves. As I understand it, she was face down in about a foot of water," the expert testified.
Finally, the case drew to a close. If the jury found Justin guilty, he could be sentenced to death.