The Hawaii doctor and his wife stood on the precipice one March morning last year.

It was her 36th birthday and they were on a picturesque hike on Oahu, in the midst of navigating a rocky patch in their marriage after she admitted an “emotional” affair.

She didn’t want to continue on the trail, along the edge of a treacherous cliff. He did. What happened from there landed them in a Honolulu courtroom, the husband charged with attempted murder.

Arielle Konig, a nuclear engineer, told the jury her husband, Dr. Gerhardt Konig, an anesthesiologist, pushed her toward a cliff edge, tried to inject her with a syringe and bashed her head repeatedly with a rock. She testified against him March 24 – a year to the day of the alleged attack.

Her account stands in stark contrast to that of her husband, who took the stand this week in his own defense, telling jurors he hit Arielle in the head with a rock in self-defense after she tried to shove him off a cliff.

Gerhardt Konig is the latest defendant in a high-profile case to testify in their own defense, a risky move since it subjects them to cross-examination. Brendan Banfield, who was accused of killing his wife and another man, and Colin Gray, the father of a school shooter, both took the stand to try and convince jurors of their innocence. Both men were convicted of all charges.

Gerhardt has pleaded not guilty to second-degree attempted murder. If convicted, he could face a sentence of life in prison with the possibility of parole.

The jury hearing Konig’s case must ultimately decide how much weight to give to the conflicting testimonies, which are at the heart of the trial.

The case also featured harrowing testimony from multiple witnesses, including Gerhardt’s son, who said his father confessed to the attack in a FaceTime call. The jury is expected to begin deliberating next week.

The unraveling of ‘our dream life’

Arielle and Gerhardt Konig married in 2018 and later had two sons together. He had two children from a previous marriage, and one of them joined the family on their move to Maui in 2023.

“Once we were here and settled in, it was our dream life,” Gerhardt told the jury, describing the adventures their family would go on together.

However, Gerhardt said he became suspicious of his wife the following year, after she went on a business trip with a male co-worker. When Arielle started spending more time on her phone, he said, he began secretly reading through their messages.

“She was obviously deleting things and trying to hide things,” Gerhardt said. “I just wanted to understand what was going on.”

Gerhardt Konig testifies in his attempted murder trial.

KHNL

Arielle Konig testifies in court.

KHNL

He read through personal conversations between Arielle and the co-worker that spanned the entire day, with the two often exchanging photos and links to songs, Gerhardt said. The conversations had abrupt cutoffs where it seemed messages had been deleted, he said.

Arielle testified she had an “emotional affair” with the co-worker and would delete their “flirty texts,” but maintained their relationship never became physical. When Gerhardt confronted her about the relationship in December 2024, he was “angry and upset,” she said.

Arielle apologized profusely for the affair and said she would do anything to fix their marriage, Gerhardt said. Even though he was “devastated,” Gerhardt said they decided to stay together and try to work things out in marriage counseling.

Digital records shown in court during Gerhardt’s cross-examination show he reviewed multiple documents related to his previous divorce and his current wife’s finances during this tumultuous period. He confirmed that if Arielle died, he would receive her retirement funds.

“All these financial documents (prosecutors) brought up, were you trying to see if it would be cheaper to kill her than divorce her?” defense attorney Thomas Otake asked.

“No,” Gerhardt said, adding he reviewed the records as part of their routine financial planning.

In January 2025, Gerhardt medically treated a woman who was hit by a falling rock at a waterfall, he confirmed during cross-examination.

The next month, his internet search history showed visits to websites about difficult hikes on Oahu – the nearby island where the couple was planning a trip to celebrate Arielle’s 36th birthday. One webpage he visited described the scenic “Pali Puka” trail, saying “much of the path is on the edge of a huge drop off,” according to digital records displayed by prosecutors in court.

“Be safe going down and take it slow as it can be slippery and the drop looks very unforgiving,” the website said.

Gerhardt said he was drawn to the Pali Puka hike because it had beautiful views along a relatively short path.

After arriving in Oahu for their weekend getaway, the Konigs visited a spa and went shopping. The next day – Arielle’s birthday – Gerhardt gifted her a necklace and a handwritten card professing his love before they set out on the Pali Puka trail.

She said

Shortly after the couple started the scenic hike, Arielle became uncomfortable with the steepness and refused to go on, she told the jury. Her husband continued ahead for a while, and when he returned, he seemed surprised she was still there, she said.

Arielle Konig displays a scar on her forehead during her testimony in Gerhardt Konig’s trial.

Pool/KITV

Arielle held onto a tree while they took a selfie near the edge of the cliff. When she started to walk toward Gerhardt after the photo was taken, he startled her.

“He grabbed me really forcefully by my upper arms, and he said, ‘I’m so f**ing sick of this sh*t, get back over there.’ He starts pushing me back towards the cliff,” she testified.

Arielle wrestled to get away and threw herself onto the ground, grabbing onto trees and shrubs so he couldn’t push her off the edge, she said. Her husband then climbed on top of her and straddled her with his legs across her waist.

“He was on top of me. He had a syringe in his hand and he said, ‘Hold still,’” she testified.

Arielle said she knocked the syringe out of Gerhardt’s hand and struggled to get away, biting his forearm and squeezing his testicles as she screamed for help.

“He’s saying, ‘Shut the f**k up. Nobody is going to hear you out here. Nobody is coming to save you,’” she said.

Gerhardt then repeatedly bashed her in the head with a rock, Arielle said, estimating he hit her as many as 10 times.

“I just started screaming, because in my mind he’s trying to knock me unconscious to be able to drag me over the edge. I was just screaming then as much as I could,” she testified.

Finally, Arielle heard a woman’s voice say she was calling 911, she testified.

“He froze and knelt back away from me,” she said. “I crawled away really slowly.”

Two women on the trail helped her to safety, while her husband stayed there frozen, Arielle said.

The women testified earlier in the trial they had just started their hike when they heard a woman screaming and saw a man hitting her with a rock. They identified the man as the defendant.

He said

Only a few minutes after the couple began hiking, they got into an argument about Arielle’s paramour, Gerhardt testified.

“I just stomped off up the trail, and this was a point where we were both really kind of just upset with each other,” he said. “I went one way and she went the other way.”

The beginning of a hiking trail at the Nuuanu Pali Lookout is seen on April 7, 2025, in Honolulu, where Gerhardt Konig allegedly attempted to kill his wife.

Marco Garcia/AP

When Gerhardt returned to his wife, she apologized and said she didn’t want to ruin the day, he testified. Arielle tried to lift his spirits, he said, and the two took some pictures together.

As he was deep in thought staring out over the edge of the cliff, Gerhardt said, he suddenly felt a shove that almost pushed him over the edge.

“(I) barely caught myself and turned around and looked at her and was like, ‘What the f**k was that?’” he testified Wednesday.

As Gerhardt approached his wife, she began yelling before she pulled them both to the ground and grabbed his testicles, he said.

“I’m thrashing and I get both hands free and I’m trying to get her to let go of my testicles and then she hits me with a rock on the side of the face,” he testified.

Gerhardt said he wrestled the rock from Arielle’s hand and hit her on the side of her head with it two times. She then released his testicles and ran away with other hikers down the trail, according to his testimony.

“I believe in the right to self-defense, right? But in the moment, it was kind of an impulse,” Gerhardt told the jury, adding he felt “horrible” he hurt his wife.

“Did you have a plan to kill your wife on the mountain that day?” Otake, the defense attorney, asked.

“No,” Gerhardt said.

A forensic pathologist called by the defense testified Arielle’s injuries were consistent with being hit about two or three times – not around 10, as she estimated.

Father and son on FaceTime

Gerhardt told the jury he was in “severe emotional distress” after the altercation with his wife and he decided to kill himself.

“I just felt hopeless at that point in terms of everything,” Gerhardt said. “I felt horrified about what I did to her, that I caused this to her, that I had resorted to violence against my wife, the person who I love the most in the world, and just kind of felt hopeless in terms of our relationship too.”

Emile Konig, 20, took the stand in his father’s attempted murder trial.

KHNL

Gerhardt said he made a last-second decision to call his 19-year-old son to say goodbye.

The son, Emile Konig, testified Tuesday that his father confessed to the attack and threatened to kill himself on the FaceTime call.

Gerhardt said “that he would not be making it back to Maui and to take good care of the younger kids,” Emile testified. “(He said) that Ari, my stepmom, had been cheating on him and that he tried to kill her.”

Roughly an hour later, Gerhardt allegedly FaceTimed his son again and repeatedly said he was going to jump off a cliff and he had thought about suicide in the months prior. “I’m going to go before the police catch me,” Gerhardt said, according to his son’s testimony.

Emile said that was the last time he spoke with his father.

Gerhardt maintained he didn’t tell his son he tried to kill Arielle, but conceded the details of the conversation were fuzzy because he was distraught. He recalled telling his son Arielle had an affair, got hurt, and her head was bleeding.

“I think I was saying to myself, like, ‘She said I tried to kill her,’” he said.

Gerhardt became choked up as he recalled Emile’s testimony, when his son only referred to him as “the defendant.”

“He saved my life that day,” Gerhardt said as he dabbed his face with tissues. “But I put him in this position where he is now – where he thinks I tried to kill her.”