A Ukrainian actor, who was fighting for his country on the frontline amid Russia’s invasion, has died while carrying out his orders, the Odesa International Film Festival said on Sunday.

Pasha Lee, who served on Ukraine’s territorial defense unit after he put his acting and TV hosting duties to the side when the war began, was killed in action during a Russian shelling in Irpin, a Facebook post shared to the film festival’s profile said. He was 33.

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Ukrainian actress Anastasiya Kasilova, who worked with Lee on the crime TV show "Provincial," took to Facebook to mourn Lee’s death.

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"He is an actor, TV presenter, my colleague and a good acquaintance," Kasilova wrote about Lee. "Never forgive!"

Actor and composer Pasha Lee was killed in action during a Russian shelling as the war in Ukraine rages on.

Actor and composer Pasha Lee was killed in action during a Russian shelling as the war in Ukraine rages on. (Facebook)

Lee was also a well-known singer and composer, the post said. 

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He had starred in the theater space and also in a number of commercials and films such as Lyubomyr Levytsky’s "Shadows of Unforgotten Ancestors" and Oleksey Shaparev’s "The Fight Rules," as well as Valentyn Vasyanovych’s "Zvychayna Sprava" and "‎Meeting of Classmates," among other cinema projects.

The Office of the United Nations High Commissioner for Human Rights has confirmed 406 civilians killed in Ukraine since Russian President Vladimir Putin's invasion began on Feb. 24. And 801 more civilians were injured as of midnight Sunday, the office said, noting that fighting has stymied accurate reporting, and the numbers are actually higher. 

Fox News' Stephanie Pagones contributed to this report.