MEMPHIS, Tenn. - Authorities arrested the man they believe to be responsible for killing a woman at Shelby Farms after a high speed chase across the Mid-South, according to several law enforcement agencies. 

The Shelby County Sheriff's Office (SCSO) identified the woman as Ellie Claire Young, 22, of Henning, Tenn. She died at the scene. Click here to visit a GoFundMe set up by Young's family. She was participating in a walk benefiting the American Cancer Society at Shelby Farms Park when she was shot and killed on October 19. 

Young was a medical student at the University of Tennessee Health Science Center, the school told FOX13. Those who knew Young told FOX13 that she aspired to become a doctor. 

Jackson Hopper, 26, was booked at 201 Poplar and charged with first-degree murder in Young's death. SCSO said that Hopper was an ex-boyfriend of Young's. Investigators said more charges may come. Monday morning, Hopper pleaded not guilty to murder, his attorney Leslie Ballin told FOX13. 

Hopper also faces charges in Tipton County, according to Tipton County Sheriff Shannon Beasley. The sheriff told FOX13 that Hopper has been charged by his office with possession of a firearm during the commission of a dangerous felony, felony evading, aggravated assault, reckless endangerment, reckless driving, resisting arrest and multiple traffic violations. 

A witness at the scene took a picture of Hopper's parked white Honda CRV behind the victim's Jeep at the time of the shooting, according to his arrest affidavit. The picture taken by the witness appeared to show the same Kentucky temporary tags seen in the photo on a license plate reader camera at the entrance of Shelby Farms Park, SCSO said. 

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FOX13 spoke to a witness who said she saw the shooting unfold.

“This young lady, she was still running and a young lady behind her. A white car pulled up and shot her twice,” Monica Bell told FOX13. Bell was a participant in the cancer walk.

The shooting happened in the parking lot of the Shelby Farms Visitor Center around 12:15 p.m. while crowds were at the park participating in the American Cancer Society’s “Making Strides Against Breast Cancer” event.

“I was having a good time and after I got through walking, I’m walking toward my car and these young ladies started running and the man, 'Pow, pow' and pulled off,” Bell said.

Another witness said that they didn't even know what was happening until it was too late. 

“Everything was still going on down there normally, still carrying on, people still walking,” the witness said. “It sounded like, you know, how a car backfires? That’s what it sounded like but come to find out, we got done with it, they said a man shot his wife in the head.”

According to investigators, Hopper drove away. Officers in Dyer County later took him into custody after a police chase. The Dyer County Sheriff’s Office said he attempted to run over one of its sergeants and even drove the wrong way into oncoming traffic. 

“Out of a hundred years, I never would have figured this would have happened out here,” said Florida Person, who says he visits the park often. “What was in that man’s mind? I don’t know; the devil had him. He’s full of the devil. That devil is working.”

Investigators said the pursuit went through Tipton County, Lauderdale County and into Dyer County. It ended after a PIT maneuver on Highway 51 in Dyer County.

Hopper was taken into custody and evaluated at the emergency room by medical staff. Deputies report locating a loaded handgun in the suspect’s vehicle.

Dyer County Sheriff Jeff Box thanked law enforcement agencies in Shelby County, Tipton County and Lauderdale County as well as the Mason Police Department and the Tennessee Highway Patrol for their assistance.

Shelby Farms Park released a statement on the shooting, saying:

"We are deeply saddened by the incident that occurred at the Park in the Visitor Center parking lot today. There is no threat to visitor or public safety. This is an active investigation and we are referring all questions to the Shelby County Sheriff's Office."

Whether or not Hopper will be given a bond, and if so what that bond will be, will be decided Monday, October 28. The 26-year-old will remain in custody until that time. Shelby County District Attorney Steve Mulroy said that his office will ask that Hopper not be granted a bond. 

"The murder of Ellie Young at Shelby Farms Park is a heartbreaking tragedy, and my deepest condolences go out to her family and friends. Due to the severity of this case, our office has requested that no bond be granted pending a hearing. Every homicide in our community is a devastating loss, and every victim deserves justice. Miss Young's case underscores the critical need to address the widespread issue of domestic and intimate partner violence. Recently, our office recognized Domestic Violence Awareness Month by spotlighting our Domestic Violence Unit, which manages thousands of cases each year, and by providing resources for individuals who may be experiencing abuse. If you or someone you know is in an abusive relationship, I urge you to seek help and support. In Shelby County, the Family Safety Center operates a 24-hour domestic violence hotline for assistance at (901) 222-4400," Mulroy said. 

On Tuesday, October 22 between 7 p.m. and 8 p.m., friends, loved ones and supporters will come together to honor Young with a candlelight and prayer vigil at Crihfield Park in Halls, Tennessee.