Her father, Charlie Ludemann, confronted Wade, whom he said he saw sitting at the scene, smoking a cigarette.
"I said, Rachel, why -- you stupid bitch, you couldn't fight with your hands. And Sarah's layin' there in a puddle of blood," he said.
Wade, he said, didn't answer.
The doctors struggled to save Sarah Ludemann, but her wound was too massive. At 2:29 a.m., the teenager was pronounced dead.
Ludemann's parents went to see their daughter as doctors worked to revive her, but Camacho, they said, stayed in the waiting room.
"I said to Josh, "I gotta go see Sarah. You ought to come," Charlie Ludemann said. "[He said] 'No, I can't see her like that.' And I told him, 'You're the reason she's like that.' And then I left."
Camacho was banned from the funeral.
Police arrested Rachel Wade for the murder of Ludemann soon after her death. This past July, at age 20, Wade went on trial.
Camacho was among 12 witnesses to testify. He conceded that Ludemann and Wade had fought over him but said little else otherwise.
"There was this young ? petite man that would come into court wearing a coat and tie, but he certainly was somebody who wanted to be tough, wanted to be the puppet master and tell these girls what to do and how to do it," said Wade's defense attorney, Jay Hebert.
Wade was the last to testify. The teenager told the court that she was just trying to defend herself.
Prosecutors weren't buying it: They played a threatening voice mail message that Wade had left for Ludemann. Wade said, "Now your ass is mine, and I am guaranteeing you I am going to f--king murder you. I am letting you know that now ... you're a f**king fat bitch, and I am going to f**king kill you, I swear on my life."
Wade told the court that Ludemann had also threatened her.
"Nobody really ever approaches people anymore and just talks to them," Wade said.
"So everybody goes out there and takes a knife and stabs people in the heart," prosecutor Lisset Hanewicz replied. "That is what happens?"
The jury needed only 2½ hours to reach a verdict. They found Wade guilty of second degree murder. She was later sentenced to 27 years in prison, where she remains today.
Wade told "20/20" that she now talks to Ludemann, asking for her forgiveness.
"I wish that we could have sat down and talked," she said, "and that I wish that, you know, both of us could have been smart enough to just walk away and to realize we deserve better."