He bound her hands with leather shoelaces, then drove her south on the Seward Highway. Along the way, he kept pulling off the road, telling her he wanted to make love to her while trying to kiss her. He made her strip and said that he wanted to slash her bra with his knife.
She kept telling him, “No, I don’t want to do it in the car.”
He finally got a motel, deep into the Kenai Peninsula at Cooper Landing, 98 miles south of Anchorage. They tried to have sex, but he was impotent. On the way back to Anchorage, he threatened to kill her if she said anything about what happened. At some point he drove her deep into the wilderness and she had to beg for him to drive back to civilization.
Troopers pulled out their book of criminals and Patty pointed to Robert Christen Hansen, later known as serial killer “Butcher, Baker."
Robert had been arrested the month before for an assault with a deadly weapon involving a real estate secretary. When he kidnapped Patty, he was out on his own recognizance, awaiting trial.
Patty told investigators, “He said he killed before, and everything he said was absolutely true. Everything he said he would do to me came true, everything he said he would do, he did. Every threat he made, I believed. And if he says he’s killed people, I believe he’s killed people. And if you’ve got a young girl who’s been killed around the same time and in the same area, then I believe it was Hansen who killed her. I believe he’ll kill me, too.”
Police interviewed Robert Hansen on December 29. He claimed to have only vague memories of the Patty and asked to speak with his attorney.
Robert did end up making a hand-written statement as to his whereabouts on December 22nd and in it he underlined the time "10:30".
"Went to work at 4:45 December 22, 1971. Got through work at 2:00 p.m. Went home to 327 Thomas Court. Spent the rest of the afternoon from 2:00 p.m. to 5:00 p.m. with my wife and sister-in-law and daughter, then left to Larry Bivins’ on 6th St. for pizza supper. Left there about 10:30 went home with my wife and daughter. Went to bed about 11:00 p.m. Got up again about 4:30 dressed and arrived at work about 4:45 a.m. Thursday and worked until 2:00 p.m."
He seemed well aware of the timeframe when Beth disappeared and had an alibi.
Robert Hansen was arrested and convicted in 1983 and was sentenced to 461 years without the possibility of parole for the abduction, rape, and murder at least seventeen women in and around Anchorage, Alaska. As a part of his plea bargain that took the death penalty off the table, he marked on a map of where to find his victim's bodies. He marked the areas with X's. There was an X where Beth's body had been found.
ZeZe Mason was a 20-year-old airline employee who was hitchhiking to town on her day off. her half-clothed, sexually assaulted body was found on August 28th, 1972. There were some distinctive tire tracks left at the scene. Where all the tires should have their knobby edges biting outward to provide more grip, one of the edges was biting inward.
Shortly after ZeZe’s body was discovered, a woman who identified herself as the girlfriend of a man who was in the white 4-wheel-drive truck on the day ZeZe Mason was murdered called authorities. She told them she wanted to make sure that they were looking for the right person in the truck that day. That person was not her boyfriend, but someone else named Gary Zieger.
When they talked to the boyfriend, he confirmed that he and Gary had gone for target practice near the gravel pit and had picked up a female hitchhiker. They left the gravel pit with the young woman riding in the middle, he said, and then Zieger dropped him at a nearby fire station. After that, Gary and the female continued on their way.
Authorities obtained a search warrant for Zieger’s truck and ran a precipitant test on three small blood spots splashed up by the dash in the interior of the vehicle. The test came back positive, which indicated human blood.
The site near a creek where Zieger had washed the truck those same weird tire tracks were found.
Gary Zieger ended up going to trial but was acquitted of ZeZe's murder. After his release, a trooper pulled over Zieger and searched his truck. Two cases of dynamite and eleven pounds of marijuana were found. Zieger was arrested and taken to Anchorage, where he was jailed on a $50,000 bond. He was charged with burglary, grand larceny, and possession of narcotics with intent to sell.
Zieger's friend that he met in prison, Wesley Ladd, put down the cash bond, which had been previously reduced to $15,000.
Ladd wanted to control a massage parlor owned by a man named John Rich. Zieger and Ladd paid him a visit and Zieger ended up shooting and killing John.
Zieger's trial for the marijuana and the dynamite came two months after John's murder, and he was convicted on all counts. He decided to appeal the ruling. But Zieger didn't have money to do that, so he hatched a plan. Jimmy Sumpter owned two of Anchorage’s most popular topless joints, the Kit Kat Club and the Sportsman Too. And he was known to keep a stash of cash at his house.
A month later, Jimmy's house was broken into while he was checking on his clubs. The intruder shot and killed his wife and his son, only his daughter made it out alive. The intruder escaped with twenty thousand dollars in cash and jewelry.
In canvasing Sumpter’s neighborhood, troopers came across a woman who’d seen a Dodge pickup truck leave the scene. She’d taken its license number and it ended up belonging to Gary Zieger. Zieger was then served with a warrant to impound his truck in connection with the Sumpter murders.
While the authorities we were getting ready to arrest Gary Zieger, somebody else got him first. He was found at mile 110 of the Seward Highway, just up the road from where Beth van Zanten had been murdered. He was sprawled in the middle of the pavement, with a fatal shotgun blast to the belly.
Wire that was similar to that which Beth had been bound with was found at his house, but the FBI said it wasn't a match. There were people who suggested that Zieger looked a lot like the composite picture of the man allegedly seen with Beth on the night of her disappearance. There was also an informant who told investigators that Beth’s cousin Greg had lived with Zieger in the months after her death, when he presumably was no longer welcome in the van Zanten household.
Beth's murder remains unsolved.