A doctor accused of attempting to push his wife, a nuclear engineer, off a cliff in Hawaii faced intense scrutiny about their personal lives during his trial for attempted murder.

The 47-year-old doctor, Gerhardt Konig, revealed in court on Thursday that the last time he and his 37-year-old wife, Arielle, were intimate was on Christmas Eve 2024.

According to testimony, the couple ceased their physical relationship after Konig confronted Arielle about her affair with a colleague named Jeff Miller, calling her derogatory names in the process.

Arielle testified last week that her relationship with Miller was an ’emotional affair’ lasting three months, during which they exchanged flirtatious messages. However, she denied any physical involvement with him.

On Thursday, Konig admitted to reaching out to Jeff Miller’s wife, Andrea, to inform her about the ‘inappropriate relationship’ between their spouses.

An email presented to the jury showed that Konig had provided Andrea with Arielle’s contact information, encouraging her to get in touch.

Prosecutor Joel Garner accused Konig, an anesthesiologist, of wanting Andrea to contact Arielle so she could ‘punish and humiliate her.’ The doctor testified: ‘That is absolutely not true.’

Konig has admitted to bashing Arielle 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 after she shoved him and struck him with a rock.

Gerhardt Konig, pictured in court Thursday, called his wife Arielle a ‘lying b***h and whore’ after confronting her about her affair with her colleague, his attempted murder trial heard

A new photo presented to a courtroom in Hawaii on Thursday showed the extent of Arielle’s injuries after the attack  

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

Konig grew suspicious of Arielle after she was constantly on her phone and hiding her screen from him, the court heard earlier this week.

He told jurors how he ‘unlocked her phone while she was sleeping’ and discovered her months-long text thread with Miller.

The thread – which saw the pair exchange photographs of themselves – appeared fragmented, so he believed Arielle was deleting her messages, Konig said. 

‘I had a lot of different feelings, suspicious, not happy. Fair to say, upset,’ he testified Thursday, sharing for the first time his reaction to the affair.

Konig decided to go into ‘detective mode’ and monitored their communications in live time from his laptop over a period of 48 hours, the jury heard. 

He kept a Microsoft Word document of Arielle and Miller’s messages, noting which ones she would delete from the app, he told the court. 

Among the deleted messages were texts where Miller wished her ‘good morning,’ asked about her sleep and if she was a fan of the band Blues Traveler.

‘There’s nothing sexual in these messages, is there, Dr Konig?’ Garner asked. Konig replied: ‘No.’ 

This is the message Konig sent to the wife of the man his spouse Arielle confessed to having an ’emotional affair’ with 

Another photo shown in court Thursday depicting Arielle Konig’s injuries 

‘This is two people saying good morning to each other, right?’ the prosecutor continued. Konig agreed.

‘And you were upset because in your mind, this is what spouses do, right?’

‘I wasn’t upset that they were saying good morning to each other. I was upset about the entire relationship that they had,’ the doctor testified. 

Konig further admitted to disclosing Arielle’s affair to their best friends, a married couple, before the four of them went on a couples trip to California.

The prosecution argued he wanted to ‘isolate Arielle from her best friend,’ but Konig said he merely wanted to prepare them ahead of him confronting her – which he did while they were on the group trip.

‘And in this confrontation, you called Arielle a lying bitch and a whore?’ Garner asked. 

Konig said ‘I did call her that at some point,’ but claims it was not in the initial confrontation.

He then encouraged Arielle to move out of their familial home while they were ‘dealing with the aftermath of her having an affair,’ Konig said. 

The court was shown photographs of the contents of Gerhardt Konig’s medical bag on Thursday – which included a syringe and a generic form of Propofol, the powerful anesthetic that caused Michael Jackson’s fatal overdose

The jury on Thursday was shown a photograph of the injuries that Gerhardt Konig sustained after the incident on the Nu’uanu hiking trail near the Pali Lookout on March 24, 2025

The court was also shown Konig’s booking photograph. He was arrested in Maui after having fled the scene of the assault

Their young sons were only four and 18 months at the time. 

‘No mother would want to move out of the house with kids that young, would they?’ Garner questioned.

Konig, who let out a light chuckle before answering, said: ‘I wanted her to move out of the house for us to deal with the affair and I didn’t want her to move out of the house and harm our children. I wanted both.’

He further admitted that he wanted Arielle to leave her job as a nuclear engineer to focus on their marriage.

‘If she quit her job, she would have been 100 percent dependent on you and your salary?’ Garner asked. ‘Correct?’

‘We had shared assets,’ Konig replied.

‘She would be dependent on you and your goodwill to keep a roof over her kids’ heads, right?’ the prosecutor berated.

‘She’ll be dependent on you and your paycheck to keep her kids fed, right?’

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 kept a Microsoft Word document of Arielle and Jeff Miller’s messages, noting which ones she would delete from the app, the court heard Thursday

The prosecutor, when questioning Konig about the WhatsApp messages, noted how there was ‘nothing sexual in these messages’

Konig denied the allegations, but Garner continued: ‘You want to make sure she never had contact with Jeffrey Miller ever again? You wanted control of her phone at all times?’

‘That was my strong preference for her to not have contact with Mr. Miller ever again,’ the doctor admitted.

On Thursday, it was also revealed that Konig stood to gain $250,000 from a life insurance policy in the event of Arielle’s death.

He denied trying to kill her to get at that money and to have to avoid paying her spousal support in the event of a divorce.

Konig has suggested Arielle attacked him first and that a $1.5 million life insurance policy taken out in his name was the reason she did so.  

Konig admitted 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. 

He told the jury on Wednesday that his wife pushed him from behind after they had an argument about her affair. He then put his hands on her arms, but Arielle grabbed his wrist and threw herself to the ground, the court heard. 

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

Arielle testified last week that Konig ‘forcefully’ grabbed her by her arms and pushed her toward a cliff before trying to inject her with a syringe and striking her on the head with a jagged rock. 

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

Konig feeds Arielle cake on their wedding day in 2018. The couple met on a dating app in 2016 and were married two years later. They now have two young sons

But the court on Thursday was shown photographs of the contents of his medical bag which included a syringe and a generic form of Propofol, the powerful anesthetic that caused Michael Jackson’s fatal overdose.

His attorney, who previously argued the incident was a ‘human reaction’ to Arielle’s three-month-long affair, also alleged that the nuclear engineer tried to kill him.

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