Only known survivor of sick serial killer Railway Killer tells her chilling tale of escape

The sole survivor of a sickening serial killer has come out with her story 20 years later.
Holly Dunn is only one of 16 people who survived the Railway Killer, whose real name is Angel Maturino Resendiz.
When Dunn was a 21-year-old student at the University and Kentucky, she witnessed her boyfriend Chris Maier get brutally murdered before being raped and left for dead.
The young lovers were approached by Resendiz after walking home after having a few beers at a party on August 29, 1997.
Resendiz asked the couple for money but told him they had nothing on hand.
She recently sat down with CBS on “48 Hours” to recall the horrific event.
“He asked Chris to get on his hands and knees,” she said. “He went through his backpack and didn’t find anything he wanted, and I didn’t realize it, but he was tying up Chris’ hands with the backpack behind his back.
“He took my belt and tied my hands up behind my back with my belt and he pulled Chris from the tracks on the gravel onto the grass beside the tracks.
“In my head I was panicking and saying my last prayer, thinking ‘I’m going to die.'”
Resendiz then tied them both and briefly fled, which gave the two a chance to come up with an escape plan.
“We had split seconds in where — our attacker would go back up to the tracks and we were down in the grass,” she said. “And so, we could talk to each other, and … Chris and I started strategizing.
“You know, saying ‘OK, should I run? Can you get untied?’
“I really don’t know how much time passed before our attacker came down carrying a rock,” she continued. “He came over and literally just dropped it on Chris’ head.”
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Afterward, she said she sensed that she was about to be sexually assaulted. She recalls trying to fight back while he held a weapon to her neck and threatened to stab her. In a second attempt, she tried to ask him about his friends and family to talk him down.
However, he did not budge and continued to beat her over and over until she lost consciousness.
She believes the only reason she survived is because he thought she was dead. 
And when she finally regained consciousness, she was clueless about what had happened.
“I knew that I was injured. I knew that I was hurt,” she explained. “I don’t think I knew what my injuries were. I realized that my mouth wasn’t shutting right, and I was covered in blood.
After waking up, she was able to muster up the courage to walk a short distance, where she found another student to help her out.
Chad Goetz picked her up all brutally beaten, with a broken jaw and eye socket while covered in blood and bruises, before calling an ambulance.
It wasn’t until she was in the hospital that she realized her boyfriend was gone.
She recalled: “I remember they weren’t talking about Chris. And, eventually, I asked my dad, I just said ‘Chris is dead, isn’t he?’ and my dad was like, ‘Yes he is.’”
Investigators were able to connect up to 15 murders to Resdendiz. Among those murders is the murder of a doctor in Houston that occurred 14 months after he attacked the couple.
“The majority of his attacks were by surprise,” Texas ranger Drew Carter told CBS. “Often the people were in bed asleep when he was getting ‘em. So he’s like the boogeyman coming into your house. He supports the fact that true evil does exist in this world.”
Resendiz surrendered on July 13, 1999, after his sister tipped off authorities of his whereabouts.
He was convicted of murder and sentenced to death. He died by lethal injection in 2006 in Texas.
In his final plea, the killer begged for forgiveness.
“I want to ask if it is in your heart to forgive me. You don’t have to,” he said “I know I allowed the Devil to rule my life. I just ask you to forgive me and ask the Lord to forgive me for allowing the devil to deceive me.
“I thank God for having patience in me. I don’t deserve to cause you pain. You do not deserve this. I deserve what I am getting.”