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KARE 11 Investigates: Mankato man guilty in brutal hours-long assault

John Robert Olson was convicted of 9 felony counts – including kidnapping and rape – after severely beating his ex-girlfriend and leaving her for dead.

MANKATO, Minn. — Editor’s Note: This video describing the assault was originally posted on November 2, 2023  

A 40-year-old Mankato man accused of beating, choking and raping his ex-girlfriend in August 2023 has been convicted in Blue Earth County Court.

John Robert Olson was found guilty of all 9 felony counts he was charged with in an attack that authorities say lasted for hours.

Last year, Chelsea Zamudio told KARE 11 Investigates how she finally ended the assault by playing dead.

Then, from her hospital bed, she taped Olson’s confession when he called her to apologize.

“I’m not supposed to hit you anymore and that went way too far yesterday,” Olson can be heard saying in the recorded phone call.

“You were pushing my buttons, but that doesn’t give me a right,” Olson said.

Credit: KARE 11
A photo take in the hospital shows some of Chelsea Zamudio's injuries.

The brutal assault happened just hours after Olson had been released from jail after an earlier attack on Zamudio.

Advocates for domestic assault survivors tell KARE 11 the case is an example of how Minnesota’s criminal justice system can fail to protect victims of domestic assault who report the crime.

The first attack

 The first time she called police, Chelsea Zamudio said her ex-boyfriend had waited in the dark outside her apartment and punched her so hard she hit her head on the pavement.

It was July 5, 2023.

Chelsea told officers Olson had strangled her in the past and now she feared he would kill her. 

A month and a half later, she says he nearly did.

“Everybody could see this coming a mile away,” Chelsea told KARE 11 Investigates.

Several days after punching Chelsea, Olson was arrested and charged with felony harassment and gross misdemeanor domestic abuse.

Because Olson has a criminal record a mile long – including previous domestic abuse related convictions involving another woman – the new charges could have carried enhanced penalties. He could have faced years in prison.

He was held in the Blue Earth County Jail awaiting trial on $40,000 bail. His trial was set to start September 14th.

The plea deal

The trial never happened.

On August 21st, at a pre-trial hearing the prosecutor in the case discussed the possibility of a plea deal with Chelsea. She says she objected.

“I told him just like I told everyone that is close with me that if he is released on the streets, pick a hospital or pick a morgue because it’s going to be one or the other,” she said.

Despite her objection, the next day Chelsea received an email from the office’s victim/witness coordinator telling her the prosecutor had extended an offer to Olson’s attorney and they’d reached a deal.

Credit: KARE 11
Olson's plea deal allowed him to be released from jail pending sentencing without a GPS monitor.

The terms included dropping the felony – which carried a harsher sentence. Instead, Olson agreed to plead guilty to the gross misdemeanor and be sentenced to 60 days in jail – most of which he had already served awaiting trial.

The plea agreement also called for the bail requirement to be dropped. Under the deal Olson would be released without so much as GPS monitoring as he awaited a sentencing hearing.

Last minute notice 

Later that afternoon, Chelsea learned in an email the plea would be heard the very next day and Olson would be released afterward.

“No GPS monitor, nothing. They just let him right out,” she said.

State law requires prosecutors to inform the judge if a victim objects to a plea deal. There’s no evidence that happened.

KARE 11 obtained a transcript of the plea hearing. Even though Chelsea says she told the prosecutor she objected, the transcript shows that was never mentioned in court.

Although the court ordered Olson not to have any contact with Chelsea, he quickly ignored it.

Within hours of being released, Chelsea says Olson showed up at her door. “Then he reminded me that if I testified against him, he was going to kill me,” she said.

Following through on a threat

A nine-count indictment describes what allegedly happened next.

Olson is accused of punching Chelsea in the face, knocking her to the ground, then continuing to beat and kick her – holding her captive for hours. She was beaten, choked and raped.

“Hours of kicks and slaps and punches,” she said.

When KARE 11 interviewed Chelsea last fall the bruises and stitches were still visible from the attack. Her arm was in a cast – she said she had 22 broken bones.

Credit: KARE 11
Chelsea Zamudio still had bruises and 22 broken bones when she spoke to KARE 11.

Photos show her apartment caked in blood.

Prosecutors say Olson held her captive until she played dead.

“Nothing about that is keeping her safety in mind.”

Advocates for domestic assault survivors say Chelsea’s case is alarming.

Joe Shannon helps put together Violence Free Minnesota’s annual domestic violence homicide report – focusing on five key risk factors for deadly violence.             

“In this case there were four of those. She had left the relationship, there was a history of violence, he had strangled her, and he had threatened to kill her,” Shannon said.

When victims tell authorities they fear their partner will harm them, he says, they need to believe it.

Credit: Mankato Department of Public Safety
Crime scene photos show the bloody floor in the apartment where Chelsea was attacked.

Shannon reviewed court documents in the two cases in which Olson was charged with attacking Chelsea. He says he was surprised by the plea deal – especially lack of GPS – and appalled by the fact that Chelsea was given just one day’s notice.

“Nothing about that is keeping her safety in mind,” he said.

Minnesota law requires victim notice. However, it is silent on how much notice must be given.

When KARE 11 originally aired Chelsea’s story, Blue Earth County prosecutors declined to comment on this case because they were still prosecuting Olson for the second attack.

Limits to what the system can do

Former Ramsey County Attorney Susan Gaertner has long advocated for victims of domestic abuse. She still works with many to file orders of protection.

“When domestic violence victims report what has happened to them to the system, they are often disappointed with the limits to what the criminal justice system can do,” Gaertner said.

She says the justice system is primarily designed to punish offenders. She acknowledges it’s not always set up to protect victims.

Prosecuting domestic abuse cases can be complicated, she explained.

Sometimes – like in the first assault Chelsea reported – prosecutors have to make tough choices on how best to protect the public.

“Sometimes that can mean getting a conviction so that the next time around when the behavior is repeated, there is a more serious consequence,” Gaertner said.

“You were dead for like eight minutes.”

From her hospital bed after the second assault, Chelsea vowed to do all she could to ensure Olson wouldn’t get out again.

Knowing he’d call, she downloaded a recording app on her cell phone.   

He did call, asking “You’re not going to record this and get me in more trouble are you?”

Chelsea was recording as he apologized again and again.

“I’m so sorry babe. I’m so sorry,” he said.

Credit: KARE 11
In a recorded phone call Olson admitted he thought Chelsea was dead.

Olson admitted he believed he’d killed her. “You were dead for like eight minutes – literally.”

Chelsea turned the recording over to prosecutors. “I wanted to do everything I possibly could to make sure the state couldn’t say we don’t have enough, we’re not sure,” she said.

This week Olson was convicted of all charges, including criminal sexual contact, assault, kidnapping and witness tampering. He is scheduled to be sentenced on June 21.

Chelsea wishes it wouldn’t have taken an attack that nearly killed her to put him back in jail.

If you or someone you know is experiencing partner abuse there are resources to help.   

Minnesota DayOne Hotline: 866-223-1111

Violence Free Minnesota: https://www.vfmn.org/get-help

Chelsea’s GoFundMe: https://www.gofundme.com/f/chelsea-zam-zzarro-recovery-fund

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