Lindsay Haugen had been dating Robert Mast for just four weeks when she strangled him to death with her bare hands because she "wanted to know what it felt like".
Chillingly, the 36-year-old claimed she had murdered her boyfriend "because he asked me to" as he struggled to battle his depression.
Haugen has now been sentenced to 60 years in prison after admitting the murder.
The court was told she had put her arm around his neck to choke him and held her hand over his mouth for 20 minutes when she committed the brutal crime in 2015.
Amazingly, Robert's mother and step-father have forgiven their son's killer and regularly visit her in prison.
They say "we have lost a son but have gained a daughter".
Haugen's murder of Robert is featured in the first episode of the new series I Am A Killer, which took Netflix by storm and is now being shown on Crime+Investigation.
Dubbed the new Making A Murderer, it examines what drove some of America's most notorious murderers to kill.
Haugen, who murdered Robert in a car park supermarket car park in Montana, claims she is "heartbroken" over her boyfriend's death.
She said: "He was only 25 and he had his whole life ahead of him but I made a choice and I took his life.
"Nothing I can do can undo that."
The killer admits she was a rebellious teen when she was at school and when she was just 15 she ran away from home.
By age 16, she was addicted to heroin and by 17 was pregnant with her son.
Determined to turn her life around, Haugen returned home to her family and enlisted with the National Guard while her mum looked after her baby boy.
She admits she loved her time in the forces but started a relationship with a man who was abusive.
He would regularly beat her, rape her and spit food and beer at her.
Haugen's partner even tried to kill her and was eventually jailed for his attack on her.
Devastated, she left the National Guard and returned home and started drinking heavily.
But then, at a house party in August 2015, Haugen met Robby Mast.
She said: "He had just come out of rehab but I didn't see that, I just saw a beatuiful face among a pile of beer cans."
Robert described himself as embracing the traveller lifestyle and even though Haugen claims she offered him a place to stay permanently, he insisted he preferred life on the road.
She chose to go with him and the pair spent the next few weeks travelling.
But Haugen says Robby was clearly suffering from severe depression and would often say he wanted to end his own life.
She claimed: "He held my hand and said 'I wish I could be happy with you but I'm not and it's not you'.
"He kept telling me he wanted to see what the next life was like. I took it personally, that I wasn't enough for him to live for.
"He said he just wanted to die."
Then one day Haugen told Robby she knew a way that he could fall unconscious and not wake up.
She said: "His eyes sparkled and he asked if I would do that for him and I said 'I love you, I would do anything for you'."
Haugen claimed she was unable to go through with it – but the next day he told her he still wanted to die.
She said: "The next day he said 'I couldn't expect you to do that for me' and I just felt I'd let him down all over again."
The killer says Robby then told he still wanted to die.
She added: "I put my arms round him and he bowed his head. I put my other arm round him and squeezed until he was unconscious.
"I went to drive out of the parking lot but I realised I didn't know where I was. I looked at Robby and started to think about how I could get him back.
"I pulled out into the traffic and into another parking lot and started CPR. Then there was a knock at the window and it was a police officer."
However, chilling police interviews conducted just after Haugen was arrested show her admitting she wanted to "know what it felt like to kill someone with my bare hands".
She told police: "My last fiance broke my hand, then he got behind me, just like I did to Robby and choked me.
"I woke up on the floor and it was like I was under water and I just wanted to do that back – but he wanted it to happen."
Police also discovered Robby had been talking about his ex-girlfriend, Kate, to Hauger before his murder, something she admits she was jealous about.
Robby had left home when he was just 18 and for six years his mum, Dori, and his step-father, Gene heard little from him.
Dori said: "He was fun and he was outgoing and I loved him very much."
Gene added: "He knew his lifestyle would be painful to us and there was so much we didn't know about his life."
The couple last saw their son in December 2014 and the final contact they had with him was when they were told he had gone into rehab the following year.
He seemed to have recovered well, but just four months later he was dead.
Incredibly, Robby's family, who are committed Christians, have forgiven Haugen and are in regular contact with their son's killer.
As well as visiting her, they also call her and have a close bond with the woman who murdered their son.
Dori said: "I was able to forgive Lindsay because I know I'm forgiven by God.
"To hang onto things can bring so much restentment inside of us, it can destroy us.
"She has brought me such joy. She took my son's life but her saying sorry and we see in our forgiveness that she is an example of how I need to be with my saviour, who has forgiven me."
Hauger is not eligible for parole until 2030 and one of the things taken into consideration are the views of the victim's family.
She said: "It could be seen as beneficial to my parole. I hope to get out some day but I believe God has me here for a reason.
"If He wants me to stay in her for the whole 60 years, I will stay here.
"The only way I can show how sorry I am is to live the best life I can. If I can do something good with my life then his life will mean something.
"That might not be enough but that's all I can giveand that's what I do every day."
I Am A Killer is available on catch up on Crime+Investigation and next week's episode will be screened at 9pm next Tuesday.
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