The report on Russian military activity in eastern Ukraine that Boris Nemtsov was unable to finish before he was assassinated earlier this year has been completed posthumously and will be presented on May 12, according to Ilya Yashin, a Russian opposition activist and colleague of the late Nemtsov.

Yashin stated previously that Nemtsov had uncovered evidence that the relatives of Russian soldiers killed in Ukraine in the summer of 2014 were paid 3 million rubles (about $58,000) to sign nondisclosure agreements about the circumstances of the soldiers’ deaths.

Boris Nemtsov, a former deputy prime minister and prominent critic of Vladimir Putin, was shot to death on February 27 in the center of Moscow on Bolshoy Moskvoretsky Bridge, within walking distance of the Kremlin. Criminal proceedings against suspects in the murder case are currently underway. The suspects are all men from the Russian North Caucasus.

In February 2008, Nemtsov first started releasing special papers about Kremlin politics, coauthoring a report with opposition politician Vladimir Milov, titled Putin: Results. Over the next few years, several similar reports followed, tackling issues like Putin’s activities, government corruption, and more.