Hanna Durytska, a citizen of Ukraine, who accompanied Boris Nemtsov at the moment he was killed and who is the main witness in the Nemtsov murder case, said no one had any reason to kill the politician out of jealousy.

"I don't believe there can be such [a reason]," Durytska said on Dozhd television on Monday.

Durytska added that neither she nor Nemtsov have ever received such threats.

Durytska a said she will not be able to attend Nemtsov's funeral. "I can't come out. I probably won't go," she said.

Durytska said she had known Nemtsov for three years.

After that, Durytska said she could not continue the conversation because she was leaving to meet with an investigator.