A former Yokohama nurse suspected of being a serial killer has been served a third arrest warrant over several fatal poisonings at the hospital where she worked about two years ago.

Ayumi Kuboki, 31, admitted to the fresh murder allegations, the Kanagawa Prefectural Police said Saturday.

According to the third warrant, Kuboki allegedly killed Asae Okitsu, 78, by injecting an antiseptic into her IV drip bag at the nurse station on the fourth floor of Oguchi Hospital roughly between 7:45 a.m. and 5:30 p.m. on Sept. 15, 2016. The hospital has since been renamed as Yokohama Hajime Hospital.

Okitsu’s condition worsened suddenly after the IV drip was administered by a different nurse on the morning of Sept. 16, and she died around 1:40 p.m. the same day, the police said.

Okitsu was initially judged to have died of illness until the same surfactant substance contained in the antiseptic was detected in blood samples taken before her death. When she was admitted to the hospital on Sept. 13 she was not in serious condition.

Kuboki was served two arrest warrants last month related to the fatal poisonings of two 88-year-old men at the hospital in September 2016. The two men shared the same room. Okitsu was in a different room.

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