CHICAGO (CBS) — It has been a month now since Aurora police were reasonably certain that 6-year-old Timmothy Pitzen was alive and well.

Now, as Newsradio 780’s Steve Miller reports, hope is fading for his safe return.

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“Obviously, with every day that goes by, it’s not good,” says Aurora police spokesman Dan Ferrelli, who added that investigators are no farther along than they were during the first days of the search for Timmothy.

“The last time that we conducted any type of search was in the last couple of weeks,” he said.

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Ferrelli says police are still looking at websites Timmothy’s mother, Amy Fry Pitzen, was on in the days before her suicide. And at the vehicle she was driving–still analyzing dirt and grass found on the undercarriage.

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“We still continue to expend tremendous amounts of resources on trying to find exactly what happened to Timmothy,” Ferrelli said. “Unfortunately, there are still no solid leads.”

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Ferrelli says the suicide note left by Timmothy’s mother a month ago said she’d left her son with people who would care for him. Amy Fry Pitzen had taken her son to Brookfield Zoo and then to waterparks in Gurnee and the Wisconsin Dells. Amy Fry Pitzen was found dead last month in a Rockford hotel. Timmothy and his mom were last seen on surveillance video leaving the Dells the day before his mother’s death.