The Iowa college student who vanished from her rural town two weeks ago had plans to attend a destination wedding in the Dominican Republic this week, the groom said.

Mollie Tibbetts and her boyfriend, Dalton Jack, were meant to be at the beachside ceremony where Dalton’s brother, Blake Jack, would have exchanged vows with his fiancée.

The romantic getaway would have been the perfect time for Dalton, 20, to propose to Tibbetts, his high school sweetheart, Blake had jokingly told him.

Now, he may never get that chance.

The 20-year-old University of Iowa student had been living with the brothers for the summer and was last seen jogging through Brooklyn, Iowa, on July 18, wearing dark shorts and a pink sports top.

The psychology major was reported missing on July 19 when she didn’t show up to her job at a daycare center in a nearby town, and her case has baffled investigators.

Blake Jack told the Associated Press that on July 18, he was visiting his fiancée, Aimee, in Houghton and that his brother Dalton was working a job for their family construction company near Dubuque.

So Tibbetts had been dogsitting the night she vanished, while the brothers were out of town.

“But what she was doing that night, I have no idea,” he said. “We know something had to have happened to her.”

Investigators have confirmed his and his brother’s whereabouts that night, he said, adding that speculation they had something to do with the disappearance was hurtful.

“The people in the community know the truth,” he said.

Jack said his canceled wedding is nothing compared to what the 1,400-person community of Brooklyn is going through and urged anyone who saw anything “big or small” to come forward.

Neighbor Dave Collum said he was interviewed by investigators who told him that data from Tibbetts’ Fitbit showed she jogged past his home that evening and made it home from the run safely. He said investigators told him she was doing homework on her computer later that evening.

Investigators wouldn’t confirm or deny any specific case details.

At a news conference Tuesday, Kevin Winker, director of investigative operations for the Iowa Division of Criminal Investigation, said he couldn’t say why Tibbetts went missing or if she was abducted, but that disappearing on her own was “not consistent with her past.”

Dozens of investigators with his agency, the FBI and local law enforcement are working on the case.