Jurors are deciding whether a doctor tried to kill his wife during a cliffside hike in Hawaii

HONOLULU (AP) — An anesthesiologist accused of trying to kill his wife during a cliffside hike near a popular scenic lookout in Hawaii struck her so hard with a rock that pieces of it broke off in her scalp, a prosecutor told jurors before they began deliberating Tuesday.

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EDITOR’S NOTE: This story includes discussion of domestic violence. If you or someone you know needs help, please call the national domestic violence hotline: 1-800-799-7233 in the U.S.

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Gerhardt Konig, 47, had a plan and backup plans for murdering his wife, Arielle Konig, during a weekend trip to Honolulu for her birthday in March 2025, deputy prosecutor Joel Garner said. He tried to push her off a cliff, and when that didn’t work he tried to stab her with a syringe filled with an unknown substance.

And when that didn’t work, he grabbed the rock, Garner said.

“Every backup plan ends in Arielle’s death,” Garner said, displaying the rock and photos of her injuries.

The doctor’s lawyer told jurors Tuesday there were no such plans, and he repeatedly sought to cast doubt on Arielle Konig’s account. Gerhardt Konig has pleaded not guilty to attempted murder, and he insists he was defending himself from his wife, who he says attacked him with the rock first.

If Gerhardt Konig had wanted to kill his wife and had access to a syringe in a remote area, attorney Thomas Otake suggested, wouldn’t he have drugged her and then thrown her from the cliff, rather than having started a scuffle before attempting to fill the syringe as he was wrestling with her?

“You would use the syringe first,” Otake said. “It makes no sense.”

The trial started last month, nearly a year after Gerhadt and Arielle Konig went on a hike on the Pali Puka trail in Honolulu that ended with her bloodied and screaming that he had tried to kill her.

Their two young sons stayed home on Maui while the Konigs were on the trip. Near a lookout offering sweeping views, Gerhardt Konig — upset about his wife’s relationship with a coworker — attacked her, Garner said. It was only because two other hikers interrupted the assault that he stopped, Garner said.

The trial, with testimony livestreamed by Court TV, has aired the couple’s marital problems leading up to the hike, along with their versions of what happened on the trail.

Gerhardt Konig testified that his wife was having an affair, which he confirmed by unlocking her phone while she slept. The relationship, which Arielle Konig characterized as an “emotional affair” involving flirty messages with a coworker, came up during the hike.

Arielle Konig testified that her husband grabbed her and moved her toward the cliff’s edge but she threw herself on the ground in an attempt to hold on. He straddled her and had a syringe in his hand, she said, but she batted it away. She bit his forearm and squeezed his testicles in attempt to get him off her, she said.