"This is not like him; he would never ever go missing, he would never miss work. Something is wrong. We need to do something," said Mary Brown, Riesberg's sister.
Brown says his employer, Essentia in Lytton, reported her brother missing on Nov. 1. The Calhoun County sheriff says Riesberg's last known contact with anyone can be traced back to Oct. 28.
Brown says, while her brother's phone and wallet were found in his house, his tan PT Cruiser is gone.
"I don't know if someone came to the door in the middle of the night and needed help, of course, Mark is going to help anybody. I don't know if he went out to help somebody, I just don't know why we can't find him or his car," Brown said.
This comes as a search is underway for 53-year-old
David Schultz of Wall Lake in neighboring Sac County. He's been missing for more than a week now.
Brown says it's frustrating to see all the people and tools being used to find Schultz. She thinks the Calhoun County Sheriff's Office needs to do more to find her brother.
"I said no, you can't be serious. And they said to tell you the truth, we'll probably find him in the bottom of a pond in a few years. Like just no compassion, are you kidding me," she said.
Calhoun County Sheriff Pat Riley wasn't available for an on-camera interview but told KCCI he believes Riesberg may have left voluntarily, and there is no evidence indicating anything criminal may have happened to him. Sheriff Riley also said there is no reason to believe the disappearances of Mark Riesberg and David Schultz are connected — despite only 15 miles separating them.
"This is not like him; he would never ever go missing, he would never miss work. Something is wrong. We need to do something," Mark Riesberg's sister said.
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