Vladimir Pligin, chairman of the parliamentary committee for constitutional legislation and state development, told the conference at Russia's Public Chamber on Wednesday that it was necessary to "analyze the whole system of penalties for encroachment upon the basic right - the right to live."
He underlined that from his point of view, "the punishment the legislators designed for this crime is rather insignificant."
Other societies have harsher punishment, he said.
Pligin earlier told a session of the presidential human rights council that 12 years in prison for the murder of several people was unacceptable against world practice.
"Penalties meted out in accordance with federal legislation is our problem," he said. "In many cases, they are inadmissible and absolutely inhumane because it's about people losing their lives.