This is the woman who was killed by sulphuric acid in Ukraine, Kateryna Handzyuk
Activist Kateryna Handzyuk was brought up today when questioning Ambassador Marie Yovanovitch who had presented an award to the father of the murdered Ukrainian anti-corruption activist Kateryna Handziuk at the U.S. embassy in Kyiv on April 24, 2019 and later that same day got a call from Carol Perez, Director of the Foreign service telling her to come back to Washington.
https://www.theguardian.com/world/2018/nov/05/ukraine-activist-kateryna-handzyuk-dies-from-acid-attack
The police took a man into custody, Mykola Novikov, and according to the newspaper, he was open about committing the act and said he was not ordered to do so by the police.
"Mykola Novikov, is a native of the city of Kherson. He was previously convicted on count of theft, previously convicted for illegal handling of weapons. He is a member of one of the criminal rings acting in Kherson Region. It is clear he was carrying out an order. Police are checking his connections and contacts," he said. He insists that the masterminds have nothing to do with police. "There are some ideas. But I can say it at once that these masterminds and organizers have nothing to do with police. Although Handzyuk and her friends publicly said that police were involved. It is absolutely not true," he said.
https://en.lb.ua/news/2018/08/06/6399_kherson_activists_suspected.html
Then the police bungled the investigation and his friends said he was with them, and he was let go.
New and very disturbing details have emerged regarding the police investigation into the savage acid attack on Kateryna Handziuk, an adviser to the Mayor of Kherson and a civic activist known for her hard-hitting criticism of the police. Not only are the Kherson police obstructing the investigation by the SBU [Security Service], but they are also showing suspiciously little interest in interviewing people who can provide their suspected assailant with a firm alibi for 31 July, when the attack took place.
http://khpg.org/en/index.php?id=1534169451