CHICAGO (CBS) — A man convicted of killing two children and molesting a third has been freed from prison for a second time, prompting police to warn residents in northwest Indiana to steer clear of him.

Richard Doebeski, 67, served nearly 40 years in prison for stabbing and strangling two children – ages 3 and 6 – in 1964, when he was 16. He was released on parole in 2003, and then later went back to prison for molesting a boy in 2007.

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Now, Dobeski is on the streets again, and Long Beach Police Lt. Todd Bulls said he is a danger to the community.

“He’s a danger to the public, he’s a sex offender, and he evidently doesn’t have any regard for human life,” he told WSBT-TV in South Bend.

Bulls said it’s just a matter of time until something bad happens again.

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“We shouldn’t have to re-arrest the same guy over and over and over again for doing the same thing,” he said.

Bill Wallace, who lives near the home where the children’s bodies were found in a crawl space in 1964, said Dobeski should still be locked up.

“I feel that the criminal justice system has really failed us,” he said. “I’m scared to death of him; for my grandchildren, and the other children on the block.”

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Police said they are keeping tabs on Dobeski’s whereabouts. He was planning to move to a homeless shelter in Gary, Indiana.