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For most of his childhood, Chase Anderson believed his father had abandoned him as a toddler.

"He didn't care and took off," Chase thought. His parents were divorced, and he didn’t know his dad’s family.

But at 16, he contacted his dad’s brother, whom he'd never met. What he learned came as a shock: His father, Bob Anderson, had disappeared with girlfriend Kristin Diede near Wishek in 1993. They're believed to be homicide victims.

Bob and Kristin, formerly Valerie Goebel, were about 30 years old when they went missing. Each had two kids from previous relationships. Family members said Bob was an auto mechanic who liked rock music. Kristin was described as a simple and kind woman who loved her children.

They traveled to the small town in south-central North Dakota, where Kristin and ex-husband Clyde Diede grew up, so that Kristin's kids could see relatives. While there, they met with a state trooper about a custody issue.

Then, on Aug. 15, 1993, they vanished. Their bodies were never found, though the van they were driving was located days later in Aberdeen, S.D.