Manizak was last seen on July 30, 1999. At the time of his disappearance, he was on disability for his diabetes and was traveling around the country in his van. He had camping equipment and would camp each night off the highway. He often picked up hitchhikers in his travels. Manizak called his mother at least twice a week to assure her he was safe. He was last heard from when last called his mother from a truck stop east of Twin Falls, Idaho. He said he was en route to Newport, Oregon. He has never been heard from again.

Manizak may be driving his brown/copper 1970 Ford van with California license plates numbered 87647D. He hasn't claimed his disability checks or used his medical card to get diabetic supplies since his disappearance. He may be in Idaho, Oregon or Montana. His case remains unsolved.