The son of a distinguished anesthesiologist, who is facing charges of attempting to push his wife off a cliff in Hawaii, appeared to signal a rift with his father during a court appearance, potentially damaging the defense’s case.

Gerhardt Konig, 47, stands accused of assaulting his wife, Arielle Konig, a 37-year-old nuclear engineer, on March 24, 2025, while hiking the Nuuanu trail near the Pali Lookout in Hawaii.

Taking the witness stand during his father’s attempted murder trial on Tuesday, Emile Konig referred to Gerhardt as “the defendant,” while affectionately calling his stepmother “Ari.”

During his testimony, the 20-year-old Emile only called Gerhardt “father” once, and that was when he was explicitly asked about their familial connection, suggesting a deep strain in their relationship.

According to Emile’s testimony, his father video-called him shortly after the alleged incident, confessing to an attempted murder. Emile recounted the call in court.

Emile detailed how Gerhardt expressed that he might not return to Maui, instructed him to care for the younger siblings, and confessed that Arielle had been unfaithful, leading him to attempt to kill her.

Konig then said he planned to ‘jump off a cliff,’ Emile testified, adding: ‘I told him not to.’

The defense has claimed that Arielle attacked Konig first, but Emile’s testimony has seemingly cast doubt on that claim, with the young man claiming Konig never mentioned self-defense during their calls.

Gerhardt Konig’s son Emile took the stand in his father’s attempted murder trial Tuesday, telling the court that his father admitted to trying to kill Arielle Koning

Gerhardt Konig stares on as his son Emile testifies how Konig said ‘that he would not be making it back to Maui, and to take good care of the younger kids, and that Ari, my stepmom had been cheating on him, and that he tried to kill her’

Emile and Konig shared two Facetime calls after the alleged attack, the court heard.

Konig admitted to the attack during the first call and then asked if he told anyone about the incident during the second, Emile said.

‘I told him who I told — my grandparents and my mother,’ he said, referring to Arielle’s parents and his biological mother who resides in Pennsylvania.

Konig then told him, ‘I’m going to go before the police catch me.’ … He said he was at the end of his rope,’ Emile said.

Deputy Prosecutor Joel Garner then asked Emile: ‘Did he say anything about self-defense?’ 

Emile replied: ‘No.’

Garner doubled down on the question once more, asking: ‘Did the defendant say anything about Arielle attacking him?’ 

He answered ‘no’ once again. 

The renowned anesthesiologist is accused of trying to push wife Arielle Konig, 37, off a hiking trail at the Nuʻuanu Pali Lookout in Oahu

Arielle Konig is seen on police-worn body camera footage after she was allegedly attacked by her husband, Gerhardt Konig, on March 24, 2025

Emile told the court that the only reason Konig ever offered for the attack was Arielle’s infidelity after she exchanged flirtatious text messages with a colleague.  

He is seemingly close to his stepmother, having told jurors how he and his two brothers continue to live with her.

The defense seemingly tried to raise skepticism in the validity of his testimony, by highlighting how Emile’s recollection of the events has changed over time. 

‘You could tell your dad was distressed?’ Konig’s attorney Thomas Otake asked during cross-examination Tuesday.

Emile replied: ‘No.’ 

‘You remember your dad was trying to stay calm, but was distressed?’ Otake asked again, rephrasing his question. 

‘No,’ Emile answered. ‘He didn’t sound distressed. He sounded calm.’ 

But Otake pulled the statement Emile made to Maui police, in which he claimed Konig ‘sounded distressed but he sounded like he was trying to stay calm.’

Arielle’s mother Judith Mast, who also took the stand Tuesday, noted that Emile was ‘shaking, crying, very upset’ after receiving the calls from Konig.

Gerhardt and Arielle Koning on their wedding day in 2018. He allegedly tried to kill her after she admitted to having a three-month-long affair with her co-worker

Prosecutors allege that Konig attacked Arielle out of the blue on the cliff edge of the picturesque hiking spot, before two other walkers saw them during the struggle. 

The nuclear engineer, who took the stand on her birthday last week, told the court how Konig ‘forcefully’ grabbed her by her arms and pushed her toward a cliff.

‘He said, “I’m so f***ing sick of this s***, get back over there” and he starts pushing me back toward the cliff,’ Arielle testified.

Arielle said she threw herself to the ground, but Konig started straddling her and tried to inject her with a syringe, the jury heard.

She allegedly knocked the syringe away and tried to fight him off, but he responded by repeatedly hitting her in the head with a rock. 

She told the court he ‘used his full force’ when he struck her and, with tears in her eyes, lifted her bangs to show the court the scar that still remains from the incident. 

Konig admits to bashing Arielle over the head with a rock at an Oahu beauty spot in March 2025, but claims she attacked him first. 

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

Prosecutors allege Gerhardt Konig tried to push his wife over a cliff and bash her over the head with a jagged rock on the Nuʻuanu Pali Lookout hiking trail (file photo)

Jurors were shown this photo of Gerhardt Konig at the beauty spot, which had been posted to Arielle Konig’s SnapChat

Earlier in the trial, jurors saw an image of Arielle after the alleged attack, showing her with blood seeping from her head and face after apparently being struck by the rock. 

Otake said her injuries were not as bad as they looked in the picture and said she only suffered a small laceration to her eyebrow. He has argued the trial should be an assault case, not attempted murder. 

But a physician from Queen’s Medical Center testified about Arielle’s injuries last week, claiming she had suffered crushed tissue down to the skull. 

She also had small pieces of rock embedded in her skin, the doctor told the court. 

Otake previously told the court that Konig attacked Arielle after she picked up a rock and struck him in the face with it. ‘He quickly reacts, human reaction, grabs the rock, hits her twice, and stops.’ 

But prosecutors allege Konig 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. 

The attack only ended when the two female hikers heard her pleas for help and called 911, the prosecution argued.

Konig’s lawyers, however, argued that police never found a syringe or evidence that he tried to inject his wife with any substance.

The couple had been married since 2018 and had a $1.5 million home in Maui

The anesthesiologist fled the scene after the attack. He called Emile, confessed to attacking Arielle and said he was going to take his own life, audio of the conversation showed.

An eight-hour manhunt ensued in the dense woodland.

Just after the search was called off for the night, three police officers spotted Konig running out of the forest. The cops chased him down and arrested him.

The prosecution rested Tuesday. Konig, who has pleaded not guilty, is expected to testify today.