Mindy Sigg telephoned police Oct. 23, leading to the arrest of Austin Sigg, 17, in the death and dismemberment of Jessica Ridgeway, 10, in Westminster, Colo., and hasn't responded to requests for interviews, The Denver Post reported Monday.
Austin Sigg has been charged as an adult and faces 17 charges, including murder, kidnapping, attempted kidnapping and child sexual assault.
David Kaczynski, whose brother Ted was a domestic terrorist known as the Unabomber and whose bombs killed three people and injured 23 others over a 17-year span, said, "It would be really important for people to remember that this mother, who turned her son in, most likely is horrified by what he did but still loves him because she is his mother. The first thing I would say to her is, 'This is not your fault.'"
David Kaczynski's information, supplied to the FBI, led to his brother's arrest and conviction. Ted Kaczynski, now 70, is serving a life sentence in a federal penitentiary in Florence, Colo., the newspaper said.
Speaking in an interview from Woodstock, N.Y., David Kaczynski said he and his mother met with his brother's victims after the conviction, saying one told his mother, "You don't deserve any of this. It's not your fault. We don't blame you."
He added the words brought enormous comfort.