Delphi, Indiana, Murder suspect Richard Allen He allegedly confessed to the crime in multiple jailhouse phone calls to his wife before a jury Thursday.

In one interview, Allen told his wife Kathy, “I did it. I killed Abby and Libby.”

“No, you didn’t,” he said. “Yes, I did,” Allen replied.

MORE: Delphi murder suspect’s alleged prison confessions revealed in court

“Why did you say that?” Kathy said. “I know you didn’t. There’s something wrong.”

In another conversation, Allen told his wife: “I think I’ve lost my mind. … I want you to know that I did this.”

“No, you didn’t. You’re not okay.” he replied.

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Allen is charged with murder Libby German, 14 and Abby Williams, 13, On a hiking trail in February 2017. He did not admit guilt to murder.

In a separate interview, Allen told his wife: “If I’m sentenced to the electric chair or the death penalty, will you stand by me? I killed Abby and Libby.”

In another conversation, Allen said, “I did it, Kathy. I did it. Do you still love me?”

“Yes I did. But you didn’t,” he replied.

“I don’t want to upset you. I’m sorry,” Allen told his wife. “I don’t know what I did. I don’t know if I lost my mind.”

MORE: Delphi suspect went to police 3 days after murders, but ‘fell through the cracks’ for years: Sheriff

“I feel like I’m in hell already,” he told her later in the interview. “I don’t understand what’s going on.”

Allen also It was claimed that he confessed to correctional officers and, according to his testimony, a prison psychologist. However, Allen’s mental state began to be questioned while he was in custody.

A psychologist testified this week that Allen could be classified as having serious mental illness. Allen spent 13 months in solitary confinement, which he said can take a toll on a person’s mental health.

MORE: Delphi girls speak out on day of murders: ‘This was the man I waved to’

The psychologist said he believed Allen was suffering from “situational psychosis” in prison. He said Allen would have episodes of psychosis and then the disease would recede.

According to corrections officers, Allen’s strange behavior in custody included banging his head against the wall, washing his face in the toilet, refusing food, eating paper, smearing feces on his cell and placing feces on his face for two hours.

On the day of the murders, Libby and Abby saw a man behind them on the bridge and began recording on Libby’s phone, prosecutors said. Prosecutors said the man, known as the “bridge man” in the video whose audio was made public, pulled out a gun and ordered the girls to go “down the hill.”

Indiana State Police officer Brian Harshman, who said he listened to 700 of Allen’s calls and monitored his messages and video chats, testified Thursday that after listening to the calls, he believed the voice in Libby’s “bridge man” video was Allen.

The psychologist testified that Allen told him that he was ordering the girls “down the hill” and that he intended to rape them, but then he saw something (a person or a van) and was surprised.

Harshman told jurors that Allen believed a van belonging to Brad Weber surprised him. Weber, who lives near the crime scene, owns a 2000 Ford Econoline minivan. The time it took Weber to get home from work was consistent with the timing of the murders, Harshman said.

Defense attorney Brad Rozzi said police never investigated how many pickup trucks were registered in the area at the time of the murders. Rozzi also stated that multiple people, including Weber, are suspected of being the man in the “bridge man” video.

‘I did it’: The claim that the Delphi murder suspect confessed to his wife over the phone was played in court originally appeared abcnews.go.com