A New Turn In Court: After more than an hour of testimony from the Hawaii doctor, newly surfaced evidence has now changed the momentum of the trial

HONOLULU (CN) — When Gerhardt Konig stepped off an Oahu cliffside trail on March 24, 2025, he left his wife Arielle Konig bloodied on the ground behind him, her face covered in lacerations, her screams drawing two hikers who would later say they witnessed a man attacking her.

But Gerhardt Konig says what happened before that moment proves his innocence.

The 47-year-old anesthesiologist, who faces charges of second-degree attempted murder, took the stand Wednesday and Thursday in Oahu First Circuit Court.

He said his wife shoved him toward the edge of the cliff first, that she struck him with the rock before he took it from her and that he hit her only twice in self-defense before stopping on his own.

“I felt horrified about what I did to her,” he told jurors. “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.”

According to prosecutors, the Konigs’ marriage had been fracturing for months before the birthday trip to Oahu. In early December 2024, Gerhardt Konig accessed his wife’s WhatsApp account and found she had been exchanging frequent, personal messages with Jeffrey Miller, a married co-worker at TerraPower, a Washington state nuclear energy company where Arielle Konig worked remotely. The relationship, Arielle Konig testified to previously, never turned physical.

What followed was months of couples therapy and audiobooks on surviving infidelity. The couple had committed to giving their marriage a chance. Gerhardt Konig booked the Oahu trip after his wife mentioned she had always wanted to visit the island.

Prosecutors say Gerhardt Konig had been researching the Pali Puka trail for weeks, a rugged cliff above the Nuʻ uanu Pali Lookout, where he planned to kill her.

Arielle Konig testified last week that her husband grabbed her by the upper arms and pushed her toward the ridge’s edge. She threw herself to the ground, clinging to roots and brush.

She said he straddled her, produced a syringe and told her to hold still. When she batted it away, she said, he covered her mouth.

“Nobody’s going to hear you out here,” she recalled him saying. “Nobody’s coming to save you.” He then picked up a rock, she said, and began striking her in the head repeatedly.

“I just started screaming,” she said. “Because in my mind, he was trying to knock me unconscious so he could drag me over the edge.”

But Gerhardt Konig testified the argument that day was ignited when Arielle Konig told him she wanted to resume traveling for work with Miller. They separated on the trail. When he came back down, she was still there. They took a selfie together. Then, he said, she shoved him from behind, nearly sending him over the cliff’s edge.

“I felt, like, a shove, and I was almost pushed over the edge,” he said.

He said he turned to find her already five to ten feet away, far enough that he believed the push had been intentional. He moved toward her. She pulled him to the ground, wrapped a leg around him, and grabbed him by the testicles, he said. She wouldn’t let go.

She picked up the rock and struck him first, getting him “kind of good,” he said, before he wrestled it away and hit her in self-defense.

His account is undercut, however, by testimony from his own son, from a previous marriage.

On Tuesday, Emile Konig, 19, took the stand and told the jury that minutes after the incident, his father reached him on FaceTime.

“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 Konig testified on what his father told him.

When Emile Konig asked about the splatters on his father’s shirt, he said Gerhardt Konig told him, “Oh, it’s just her blood.” About an hour later, Gerhardt Konig called again.

“He said that he was just going to jump,” Emile Konig said, “and said that a couple of times.”

Emile Konig said that his call ended with his father saying, “I’m going to go before the police catch me.”

Gerhardt Konig disputed all of it. He acknowledged the word kill may have come up during the call, but said it was not what it sounded like.

“I think I was saying to myself, ‘she said I tried to kill her,’” he told the jury.

He said he had been suicidal, not confessing, and that his son had saved his life by talking him back from the edge.

Deputy Prosecuting Attorney Joel Garner spent much of Thursday laying out what he described as evidence of premeditation. Beginning on February 28, 2025, Garner walked the jury through Gerhardt Konig’s browsing history: a search for Maui secret hike, then best Oahu hikes, then a quick pivot away from YouTube videos on easy hikes toward difficult hikes.

He landed on JourneyEra.com, a travel website that described the Pali Puka trail as placing hikers on the edge of a cliff with a huge drop-off and told readers, “Does that make it dangerous? You decide.”

Gerhardt Konig acknowledged reading the entire article, seeing the photographs of the narrow path along the cliff edge and knowing that 99% of visitors to the Pali Lookout never set foot on the trail.

“This is the hike that you wanted to take Arielle on for her birthday, right?” Garner asked.

“Yes,” Gerhardt Konig said.

Garner later placed two photographs side by side on the courtroom screen: Gerhardt Konig’s face after the incident, showing what appeared to be minor bruising, alongside Arielle Konig’s face at the hospital, covered in blood.

“You say only two hits to Arielle, right?” Garner asked.

“I only hit her two times,” Gerhardt Konig said.

Arielle Konig filed for divorce in May 2025 and is seeking custody of the couple’s two children, ages 3 and 5, as well as the family home and financial damages.

She has acknowledged that the outcome of this trial is relevant to that case. Gerhardt Konig has been held in jail since his arrest. If convicted, he faces a sentence of life in prison with the possibility of parole.