Gerhardt Konig has pleaded not guilty and testified in his own defense.

As both sides rested in the trial against Gerhardt Konig, prosecutors gave one last closing argument before the jury will deliberate and determine Konig’s fate. Prosecutors argued that the doctor carried out a calculated attempt to kill his wife on a Hawaii hike, using three escalating plans: pushing her off a cliff, trying to inject her with a syringe, and beating her with a rock. They emphasized that physical evidence, eyewitness testimony, and the victim’s injuries all corroborated her account. Digital forensics, showing searches into infidelity, finances, and remote trails, further demonstrated motive, obsession, and premeditation.

Closing arguments are expected to be delivered and jury deliberations to begin on Tuesday in the trial of a Hawaii doctor accused of trying to kill his wife on a hiking trail.

Dr. Gerhardt Konig, 47, has pleaded not guilty to second-degree attempted murder. Prosecutors allege the anesthesiologist attacked his wife, Arielle Konig, near a cliff while on the Pali Puka Trail on Oahu on March 24, 2025, by pushing her near the edge and then beating her multiple times with a rock.

Hawaii doctor Gerhardt Konig appears before a judge via video during an arraignment hearing after being indicted on allegation of attempting to kill his wife, April 7, 2025, in Honolulu.

Hawaii doctor Gerhardt Konig appears before a judge via video during an arraignment hearing after being indicted April 7, 2025, in Honolulu.
AP Photo/Marco Garcia, File
The defense, meanwhile, has alleged that Arielle Konig attacked her husband first, and that he hit her with the rock in self-defense.

Both Gerhardt Konig and his wife, who have two young sons together, took the stand during the three-week trial in Honolulu, presenting widely differing accounts of what happened on the hike.

Arielle Konig testified that the two had traveled to Oahu from their home in Maui to celebrate her birthday. She said they had been working on repairing their marriage after her husband found what she characterized as “flirty” WhatsApp messages between her and a colleague in December 2024 in what she said was an “emotional affair.”

Arielle Konig testified that during the hike, her husband pushed her toward the edge of the cliff. As they wrestled on the ground with him on top, pinning her down, he produced a syringe and vial, she said.

Arielle Konig further testified that her husband proceeded to beat her with a rock as many as 10 times, and that she believed he was trying to knock her unconscious in order to drag her over the edge of the cliff.

Arielle Konig testified that she fought back by biting her husband’s forearm and pleaded with him, saying, “You can’t do it,” and that “our kids will be orphans — you’ll go to jail and I’ll be dead.”

“He’s saying, ‘You’re done. We’re done with you. We don’t need you anymore. You’re done. You’re done,'” she told the court.

Arielle Konig testified that she yelled, “He’s trying to kill me,” and screamed for help, and two female hikers happened upon them. One of the hikers told a 911 operator, “Someone’s currently being attacked on the top of Pali Puka. There’s a man trying to kill her,” according to audio of the call played in court.

Prosecutors showed photos of Arielle Konig’s bloodied face following the incident. She testified that she crawled away from her husband and was helped down the rest of the trail by the two women. She said she was treated at a hospital for “severe complex scalp lacerations” and showed the court scarring on her scalp.

Gerhardt Konig testified in his own defense over two days, maintaining that he never intended to hurt his wife and acted in self-defense when he struck her with the rock.

He told the court that his wife pushed him near the edge after they got into an argument about her affair, and that she hit him with a rock first while they struggled on the ground. He admitted to hitting her with the rock while on top of her, saying he struck her twice, though he denied having any syringes or trying to pull her toward the cliff’s edge.

Gerhardt Konig testified that he felt suicidal after the incident.

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

Shortly after the incident, Gerhardt Konig testified, he made a FaceTime call to his 20-year-old son from his prior marriage, Emile Konig, to say goodbye.

His son testified about the FaceTime call during the trial. Asked by the prosecutor to recount what his father said during the call, Emile Konig responded, “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.”

“During that call, the next plan that he said was to jump off the cliff,” Emile Konig testified, adding that his father said he was “at the end of his rope.”

Gerhardt Konig pushed back against his son’s testimony and denied making any confession. He told the court that what he said during the call was, “She said I tried to kill her.”

Gerhardt Konig was arrested following an hourslong manhunt, prosecutors said.

Arielle Konig filed for divorce in May 2025, seeking full custody of the couple’s two children.

Gerhardt Konig, who worked as an anesthesiologist on Maui, has been in jail since his arrest. Following his arrest, Maui Health said his medical staff privileges at Maui Memorial Medical Center have been suspended pending investigation.