Hooiman was last seen in Salt Lake City, Utah on November 20, 2017. He was on parole for drug- and theft-related offenses and was staying at the Fortitude Treatment Center, a men's halfway house, at the time of his disappearance. He would leave the center each day to go to work.
He spoke to his mother that morning and made arrangements for them to have lunch together. They were going to meet near a construction site at the Intermountain Medical Center in Murray, Utah. Hooiman's mother tried to call him to get a more specific location to meet him at, but her call went straight to voicemail, indicating the phone was turned off. He never showed up for lunch and has never been heard from again.
It's uncharacteristic of Hooiman to leave without warning or to be out of touch with his mother. He was reportedly having some problems with unspecified individuals at the Fortitude Treatment Center at the time of his disappearance.
Because of his status as a parolee, he was listed as an absconder from parole until late 2019, then police decided to reclassify him as a missing person. In March 2021, authorities stated they were treating the case as a possible homicide; a confidential federal informant has claimed Hooiman was murdered. His case remains unsolved.