Arie Johannes de Slegge was 63 when he vanished from Las Vegas, Nevada. He was last seen in Clark County on July 15, 1986 and was never heard from again. The Las Vegas Metropolitan Police Department lists his case as an open missing person investigation.

At the time he disappeared de Slegge was described as a white male with gray, balding or receding hair, brown eyes, about 5 feet 7 inches tall and weighing approximately 150 pounds. Very few other details have been released publicly: there is no public information about what he was wearing, whether he had personal belongings or how he was travelling. The official record for the case was created December 17, 2012.

The lack of basic timeline or lead information has left this as a cold missing person file for decades. Anyone who knew Arie, saw him in Las Vegas around July 15, 1986, or has information that could help should contact the Las Vegas Metropolitan Police Department.