The man detained on Monday on the suspicion of murdering lawyer and human rights defender Iryna Nozdrovska says he has no regrets, Ukrainian National Police first deputy head Viacheslav Abroskin said.

"There was absolutely no confession. We identified the suspect exclusively by means of the aggregate of material evidence. In the course of the post-detention interview, I personally spoke with the individual we implicate in this crime. This man made no confession and has no intention to express his regret," Abroskin said on Facebook on Tuesday morning.

The Ukrainian interior minister's advisor, Zorian Shkiriak, said some time later that the evidence collected by detectives and the outcome of a series of forensic tests conducted in relation to Nozdrovska's murder forced the man detained by the police on Monday to confess to the crime.

"The aggregate of evidence collected by officers of the National Police and the results of a series of forensic tests conducted in relation to the murder of Iryna Nozdrovska forced the suspect to confess to that crime. [...] The suspicions are substantiated, and the collected evidence is impeccable. The court will choose a measure of restraint soon," Shkiriak said on Facebook on Tuesday.

The crime motive has also been established: "these is a hostile relationship and revenge for the deceased's activity," he said.

Nozdrovska, a resident of the village of Demydiv in the Vyshgorod district of Kyiv region, was found dead on January 1, 2018. A murder inquiry was opened, and 300 officers of the National Police were put on the assignment.

According to Petro Poroshenko Bloc's deputy Mustafa Nayyem, Nozdrovska was long insisting on convicting the man who killed her sister, Svitlana, in a road accident in September 2015. "The girl was hit by a drunk driver, a nephew of the Vyshgorod District Court chairman, Dmytro Rossoshansky. Formal elements of the crime were obvious, but the family had to seek justice for more than two years. Iryna Nozdrovska, a career lawyer, was personally handling the case and addressing the court, which led to numerous threats made by the defendant and his family," Nayyem said on Facebook.

First Deputy Interior Minister Serhiy Yarovy said in the evening of January 8 that the suspected killer of the human rights defender was detained. In turn, Ukrainian Prosecutor General Yuriy Lutsenko said law enforcers had informed him about their suspicions.

The lawyers and family of lawyer Iryna Nozdrovska doubt that the detained man, Yuriy Rossoshansky, was the actual killer. "We have learned from the media that the detained man is Yuriy Rossoshansky, the father of Dmytro. Both we, representatives of the aggrieved party, and Iryna's family, including her daughter, very much doubt that the detainee is actually the perpetrator," the aggrieved party's lawyer Anatoliy Khudiakov told the newspaper Ukrayinska Pravda in a commentary.

In his words, Rossoshansky "is the easiest, simplest, and most obvious theory." "Iryna's body was found near the house of the Rossoshansky's. It was lying there as if no one had tried to hide it. The intention was to have the body found. The first people to be questioned were the Rossoshansky family," the lawyer said.

The conviction, which resulted from the inquiry into the death of Iryna's sister in the road accident involving Dmytro Rossoshansky, was not final, and nothing stopped his family "from committing the murder" over the past two years, he said.

"One cannot say that Yuriy Rossoshansky had a motive because Dmytro was put to prison and the case was over. Dmytro's defense could still use the Amnesty Law [the Savchenko Law] and he could have been amnestied and released soon enough. This makes his father's motive for brutally killing Nozdrovska quite a stretch," Khudiakov said.

Yury Rossoshansky "was rather reserved" during the years of inquiry and trial, Khudyakov said. "Some remarks and threats were made but no one, including Iryna, expected them to have any consequences," he said.

According to Khudyakov, the defense team has "lots of questions", considering that law enforcers have denied them a chance to study materials in the proceeding. "Could they be trying to keep something secret [...] as we will immediately see that their evidence is weak?" he wondered.

Iryna's family "would like to see the real result" of the inquiry rather than get "a convenient scapegoat implicated in the case," Khudyakov said. He added that the Vyshhorod District Court would choose a measure of restraint for the detainee later on Tuesday.