In this combination of photos, Indonesian Siti Aisyah, left, and Vietnamese Doan Thi Huong, right, are escorted by police as they leave their court hearing at Shah Alam court house in Shah Alam, outside Kuala Lumpur, Malaysia, Monday, Oct. 2, 2017. Aisyah and Huong, accused of fatally poisoning Kim Jong Nam, the estranged half brother of North Korea's ruler, pleaded not guilty as their trial began Monday in Malaysia's High Court, nearly eight months after the brazen airport assassination that sparked a diplomatic standoff. (AP Photos/Daniel Chan)

In this combination of photos, Indonesian Siti Aisyah, left, and Vietnamese Doan Thi Huong, right, are escorted by police as they leave their court hearing at Shah Alam court house in Shah Alam, outside Kuala Lumpur, Malaysia, Monday, Oct. 2, 2017. Aisyah and Huong, accused of fatally poisoning Kim Jong Nam, the estranged half brother of North Korea's ruler, pleaded not guilty as their trial began Monday in Malaysia's High Court, nearly eight months after the brazen airport assassination that sparked a diplomatic standoff. (AP Photos/Daniel Chan)

SHAH ALAM, Malaysia (AP) — Two women accused of smearing a banned nerve agent on the face of the estranged half brother of North Korea’s leader pleaded not guilty as their trial began Monday in the Feb. 13 assassination at a crowded Malaysian airport terminal.

Siti Aisyah of Indonesia and Doan Thi Huong of Vietnam are suspected of using VX nerve agent to kill Kim Jong Nam at Kuala Lumpur’s airport. The women say they thought they were playing a harmless prank for a hidden-camera TV show.

An airport doctor testified that Kim died rapidly, with his blood pressure and pulse first soaring and then plunging.

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After the charges were read to the women in their native languages at Malaysia’s High Court, they shook their heads “no” when asked if they were guilty.

The two women are the only suspects in custody in a killing that South Korea’s spy agency said was part of a five-year plot by North Korean leader Kim Jong Un to kill a brother he reportedly never met. Police say four North Koreans suspected of involvement left the country on the day of the attack. Three others who holed up inside North Korea’s embassy were allowed to leave in a deal with Pyongyang to ease tensions, despite Malaysia’s anger at the public use of a chemical weapon on its territory.

Lawyers for the two women, who face the death penalty if convicted, asked the court to compel prosecutors to identify four people still at large mentioned in the charge sheet as having a common intention to kill Kim. The judge denied the request.

Four witnesses testified Monday: an airport information counter worker and a police officer who were among the first to interact with Kim after the attack, and a doctor and a nurse at the airport who treated him.

Airport clinic Dr. Nik Mohd Adzrul Ariff Raja Azlan gave a detailed account of Kim’s rapid decline.

“When I saw him, his hands were clutching his head. He was closing his eyes tightly and his face was very red. He was sweating profusely,” Nik said, adding that Kim was unable to respond when asked what happened.

Nik said Kim had very high blood pressure and a quickened pulse and started to display seizure symptoms, with his jaw and teeth clenched and eyes rolling upward.

He said Kim then fell unconscious, his blood pressure dropped to 70/40, and then his pulse was lost.

The prosecution phase of the trial is expected to last about two months, after which the judge will decide if there is a strong case for the women to have to mount their defense, said Hisyam Teh Poh Teik, Huong’s lawyer.

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Kim, who was 45 or 46, was the eldest son of the family that has ruled North Korea since its founding, yet he reportedly fell out of favor in 2001 when he was caught trying to enter Japan on a false passport, saying he wanted to visit Tokyo Disneyland. He had been living abroad for years and at the time of his death was traveling on a North Korean diplomatic passport under the name “Kim Chol.”

North Korea has a long history of ordering killings of people it views as threats to its regime, though Kim was not thought to be seeking influence over his younger brother. He had, however, spoken out publicly against his family’s dynastic control of the reclusive, nuclear-armed nation.

North Korea has denied any role in the killing and has not even acknowledged the dead man was Kim Jong Nam. It has suggested the victim died of a heart attack and accused Malaysia of working with South Korean and other “hostile forces” in blaming Pyongyang.

During Monday’s hearing, Kim was referred to as “Kim Chol.” The two defendants listened intently and were briefed by translators during the trial, with Huong smiling on several occasions.

The trial will be closely watched by the Indonesian and Vietnamese governments, which have hired lawyers to defend the women.

Aisyah’s lawyer, Gooi Soon Seng, said before the trial began that her defense will be that she didn’t know she had poison on her hand when she smeared Kim’s face and was instead the victim of an elaborate trick. The 25-year-old was at a pub in Kuala Lumpur in early January when she was recruited by a North Korean man to star in what he said were video prank shows, Gooi said.

Over the course of several days, the North Korean, who went by the name James, had Aisyah go out to malls, hotels and airports and rub oil or pepper sauce on strangers, which he would film on his phone, the lawyer said.

Aisyah was paid $100-$200 for each prank and hoped the income would allow her to stop working as an escort, Gooi said.

In late January, Aisyah flew to Cambodia, where James introduced her to a man called Chang, who said he was the producer of video prank shows for the Chinese market, the lawyer said. Back in Malaysia, Chang asked Aisyah to do several more pranks at the Kuala Lumpur airport a few days before Kim was attacked. At the airport on the day of Kim’s death, Chang pointed him out to Aisyah as the next target and put the poison on her hand, the lawyer said.

Police say Chang was actually Hong Song Hac, one of the four North Korean suspects who left Malaysia on the day of the killing, while James was Ri Ji U, one of the three other North Koreans who hid inside their country’s embassy in Kuala Lumpur to avoid questioning.

Those three were later allowed to fly home in exchange for nine Malaysians allowed to leave Pyongyang. Gooi said James was key to Aisyah’s defense and that his absence could weaken her case.

Aisyah, who has a son, has written to her family and told them to pray for her “so that the case will be over soon and I can go back home.”

The 29-year-old Vietnamese suspect, Huong, was caught on airport security surveillance cameras wearing a white sweatshirt emblazoned with the big black letters “LOL” — the acronym for “laughing out loud.” Little is known about her. Raised in a rice farm in northern Vietnam, her family said they had hardly heard from her since she left home a decade ago.

She made postings on a Facebook page under the name Ruby Ruby, according to her niece, Dinh Thi Quyen.

Photos on the page show Huong wearing a white shirt that says “LOL,” like the one seen during the attack. It shows her posing for selfies in January in Cambodia and in Kuala Lumpur a few days before the attack.

Her last post was on the morning of Feb. 11, two days before the attack, from an area near the airport.