An Iowa man who says he may have been the "last person to see" Mollie Tibbetts alive is speaking out to media.
Devin Riley told "Good Morning America" he saw Tibbetts running by his house at around 9 p.m. the night she disappeared.
"I wish I did know more, but I dread that maybe I was the last person to see her," he told the morning show Thursday, according to ABC News.
Riley said he didn't know what happened to Tibbetts after she jogged by his house, but said investigators searched his home after he came forward with the information. Riley described it as a "pretty terrifying" experience initially, but said investigators were polite and left after about 10 or 15 minutes.
Riley told "Good Morning America" he had been hesitant to come forward with the information earlier but decided to contact authorities after hearing the family's pleas for information about the missing 20-year-old college student.
Tibbetts disappeared the night of July 18 while she was dog-sitting for her boyfriend, who was out of town for work at the time, and his brother. Witnesses have reported seeing her on her regular run that night and her phone and Fitbit that she is believed to have had that night have not been found.
Investigators have used data from her Fitbit along with other details of her digital footprint to try to determine her path that night. Family members have said previously there's some evidence she may have returned to the house after her run to do homework on a computer.
On Wednesday, the brother of Tibbetts' boyfriend told Fox News there had been no sign of struggle at the house and said it was impossible to know whether she had returned to the house.
"If something happened while on a run, people—like you see right now—our neighbors are outside and would have heard something," Blake Jack told the news channel.
He also said he thought Tibbetts would have "done something" if there had been an intruder at the house.
As the circumstances around Tibbetts' disappearance that night remain a mystery, new video has surfaced that shows the college student laughing and having fun the day before she went missing, according to local Iowa news channel KCCI.
The video was posted on social media by Jarrett Rose who wrote "2 weeks since I’ve seen your smile and it feels like an eternity has passed by. Your voice echoes through my heart every day, giving me the inspiration to never give up on you."
Rose worked as a camp counselor with Tibbetts before she disappeared, KCCI reported.
Her family has also shared another video of the University of Iowa college student giving an inspirational speech in 2016 while in high school about the power of prayer.
"Everyone has your own talent, whether it's a sport you are good at, or if you are good at dance or you are great writer, or even if you are just a good person, that's one of the best things you can be good at," Tibbetts said in the video.
The reward for information about her disappearance has grown to more than $300,000. Investigators are scheduled to provide an update on the case Friday morning, according to WHO, an Iowa news station.
[Photo: Poweshiek County Sheriff's Office]