Iowa man believes he may have been last person to see missing college student Mollie Tibbetts

An Iowa resident believes he may have been the last person to see Mollie Tibbetts before she disappeared.

Devin Riley says he spotted the 20-year-old University of Iowa student jogging past his home at around 9 p.m. on July 18. She did not show up for work in the small town of Brooklyn the following day.

"I've seen her probably three to four times per week," Riley told ABC News in an interview published early Thursday. "She'd kind of jog down the street and towards the hill. I thought nothing of it until I heard somebody was missing, and it really hit me that I hadn't seen that runner since then."

Riley tells "Good Morning America" that Mollie was "wearing like a neon pink sports bra with black khaki yoga pants and an armband with her music device, or phone ... hair in a ponytail, just jogging like normal, any other day."

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Missing Iowa student Mollie Tibbetts found dead
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Missing Iowa student Mollie Tibbetts found dead
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
This undated photo provided by the Iowa Department of Public Safety shows Cristhian Bahena Rivera. Authorities said on Tuesday, Aug. 21, 2018, that they have charged a man living in the U.S. illegally with murder in the death of Iowa college student, Mollie Tibbetts, who disappeared a month ago while jogging in a rural area. Iowa Division of Criminal Investigation Special Agent Rick Rahn said that Rivera, 24, was charged with murder in the death of Tibbetts. (Iowa Department of Public Safety via AP)
A county truck blocks a gravel road, Tuesday, Aug. 21, 2018, near Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. University of Iowa student Mollie Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
People in the courtroom reacts after Cristhian Bahena Rivera's initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
(Photo via Facebook)
Cristhian Bahena Rivera speaks with his attorney during his initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
(Photo via Instagram)
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
My first experience as a best man went well🎉
Cristhian Bahena Rivera is escorted into the Poweshiek County Courthouse for his initial court appearance, Wednesday, Aug. 22, 2018, in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (AP Photo/Charlie Neibergall)
You guys really thought I was gonna let a birthday pass without a selfie?😎 (posting a day after but I took it on my birthday so whatever)
Just a Hawkeye with her hot guy 💛🖤
A poster for missing University of Iowa student Mollie Tibbetts hangs on the front door of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month.Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Happiest of birthdays to the person who made track bearable. Of all of the laps we ran together, the last one was the hardest (even if we made it the slowest) because we were ending quite an era😉 You are such a happy, hardworking, and genuine person, and I'm so lucky I get to call you my friend. Happy birthday my dude 😘😊
A ribbon for missing University of Iowa student Mollie Tibbetts hangs on a light post, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Police say a body believed to be that of 20-year-old college student Mollie Tibbetts has been discovered in a rural area near where she went missing last month. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Cristhian Bahena Rivera is escorted into the Poweshiek County Courthouse for his initial court appearance, Wednesday, Aug. 22, 2018, in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (AP Photo/Charlie Neibergall)
Currently wishing I was exploring water falls with best friend instead of sitting in an airport
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
I can't think of a caption but New York is cool
A poster for missing University of Iowa student Mollie Tibbetts hangs in the window of a local business, Tuesday, Aug. 21, 2018, in Brooklyn, Iowa. Tibbetts was reported missing from her hometown in the eastern Iowa city of Brooklyn in July 2018. (AP Photo/Charlie Neibergall)
Cristhian Bahena Rivera is lead into the courtroom for his initial court appearance, Wednesday, Aug. 22, 2018, at the Poweshiek County Courthouse in Montezuma, Iowa. Rivera is charged with first-degree murder in the death of Mollie Tibbetts, who disappeared July 18 from Brooklyn, Iowa. (Jim Slosiarek/The Gazette via AP, Pool)
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He reported the sighting to the Poweshiek County Sheriff's Office and received a visit from investigators.

A woman in Marion, Iowa alerted authorities that she spotted Mollie in a store on Wednesday, but cops determined it was not her after watching surveillance video.

"It was unfounded, but we still appreciate this good Samaritan at least reached out," Tom Daubs of the Marion Police Department told the Des Moines Register. "Heaven forbid that was really her."

Marion is approximately 70 miles from Brooklyn.

The FBI is involved in the search, along with state and local investigators. The Mollie Tibbetts reward fund has grown to more than $300,000, according to Crime Stoppers of Central Iowa.

"It's gut-wrenching to know that I could have my daughter out here, and I could go inside for a minute and she could be gone," Riley told ABC. "You assume when you move to a small town that pretty much everyone is close close-knit, everyone knows everyone ... you just do not expect it to happen in a town like this."

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