A doctor accused of attempting to murder his wife by pushing her off a cliff in Hawaii appeared to laugh during his trial as he described her defense tactics, which included grabbing his testicles.

Gerhardt Konig, aged 47, acknowledged striking his wife, Arielle, who is a nuclear engineer, on the head with a rock at a picturesque spot in Oahu in March 2025. However, he contends that his actions were in self-defense.

Last week, Arielle provided testimony stating that Konig aggressively grabbed her arms, attempted to push her toward a cliff, tried to inject her with a syringe, and then hit her with a jagged rock.

During his testimony on Wednesday, the distinguished anesthesiologist recounted a different version of events, claiming that Arielle had attacked him first, prompting his reaction.

Konig told the jury that the altercation began after a dispute over Arielle’s alleged affair with a colleague, Jeff Miller, during which she reportedly pushed him from behind.

According to Konig’s account, he then held Arielle by her arms, but she grabbed his wrist and threw herself to the ground, as described in court.

She wrapped her legs around his, grabbed him by the testicles and struck him in the head with a rock, Konig testified. He then wrestled the rock away from her and hit her in the head with it twice.

‘I try to free my testicles when I get both hands free,’ Konig said. ‘Everything happened really quickly when she grabbed my testicles,’ he added with a laugh.

Gerhardt Konig, 47, laughed on the stand at his attempted murder trial as he recounted how he tussled with his wife Arielle during her assault last year

Konig has admitted to bashing his nuclear engineer wife Arielle, 37, over the head with a rock at an Oahu beauty spot in March 2025, but claims he did so in an act of self-defense

Arielle Konig, 37, was captured on police body camera footage moments after her husband, Gerhardt, allegedly tried to push his wife off a ledge on the trail and attempted to stab her with a syringe before beating her with a jagged rock

Konig recalled how after the assault, Arielle scooted towards two hikers walking along the trail and told them that he tried to kill her.

He continued walking and called his son Emile on FaceTime, the doctor told the court. During the call, he said he planned to take his own life.

‘I decided to jump,’ he said, starting to cry. Konig claimed Emile ‘saved my life that day, but I put him in this position where he thinks I tried to kill her.’

The anesthesiologist said he was in a state of ‘severe emotional distress’ after the attack and felt horrible that he’d hurt his wife.

‘I felt horrified about what I did to her, the person I loved the most in the world,’ he told the court. 

Konig told the jury how he and Arielle met on dating app eHarmony in 2016. They were both living in Pittsburgh at the time. 

They married in 2018 and now have two sons, ages five and three. Konig also has two children, including Emile, from his first marriage which ended in divorce in 2014. 

He and Arielle moved to Hawaii in 2022 because they wanted their children to grow up in a ‘safer’ environment.

He said he became suspicious that his wife was having an affair around December 2024 after he noticed some ‘red flags.’

Konig started to cry on the stand Wednesday as he recalled how his son Emile ‘saved my life that day, but I put him in this position where he thinks I tried to kill [Arielle]’

Arielle turned Konig’s medical supply bag over to police which contained syringes and medications that the defense alleges were meant to help him respond to an emergency

The jury on Wednesday was shown images of injuries that Konig suffered during the incident on March 24, 2025. He testified that the side of his face and ribs were injured after two police officers in stuck him several times

When Corporal Kevin Chun, of the Honolulu Police Department, arrived on the scene, he saw two Good Samaritans helping Arielle walk down the Nuuanu hiking trail near the Pali Lookout in Oahu as blood streamed down her head

Konig alleged that Arielle was constantly on her phone and hiding her screen from him, so he ‘unlocked her phone while she was sleeping.’

He discovered a WhatsApp thread between his wife and Miller, who was based in Maryland but traveled regularly for work, that began in June 2024.

The thread, which was created when Arielle and Miller were on a work trip in South Africa, had about two months’ worth of messages, the court heard.

He discovered the pair were sharing photos of themselves, but noticed the conversation was fragmented. He believed Arielle was deleting messages, he said.

‘I was devastated, obviously something was going on. I didn’t know what to do,’ Konig said, admitting he screenshotted the messages and downloaded them on his computer.

He then confronted his wife about the texts while on a trip in California with another couple. Konig said he told the other couple about the messages before he addressed his suspicions with Arielle directly.

Arielle last week testified that she had been in an ’emotional affair’ with Miller and exchanged some ‘flirty texts,’ but said that nothing physical ensued.

Konig told the jury how he was not satisfied by Arielle’s claim that the affair was merely emotional and decided ‘I have to catch her in a lie.’

Jurors were shown this photo of Gerhardt Konig at the beauty spot during his trial last week

Arielle and Gerhardt met on a dating app in 2016. They married in 2018 and share two sons

He secretly recorded conversations that Arielle had with her mother and best friend, and went through her financial records, the court heard.

On the morning of the attack, he learned that a $1.5 million insurance policy had been approved, which the defense alleges was Arielle’s motive for assaulting Konig.

Konig admits to bashing Arielle over the head with a rock on the Nu’uanu hiking trail near the Pali Lookout on March 24, 2025, but claims she attacked him first. 

His defense has noted that police never found a syringe or evidence that he tried to inject his wife with any substance.

His attorney also argued the incident was a ‘human reaction’ to Arielle’s three-month-long affair with her co-worker.

Konig has pleaded not guilty to attempted murder. His trial is expected to continue through mid-April.