The alumnus was found guilty of one count of terrorism, one count of assault with a dangerous weapon and five weapons-related charges. He could face life in prison.

The judge ordered Casteel to be held at Livingston County Jail until the pre-sentencing report is prepared.

During October 2012, Casteel shot at 24 cars along the I-96 corridor. He testified about his family history of paranoia and delusional thoughts.

Casteel said he believed he was a part of a government-run conspiracy after losing his job in Kentucky. He told the court he thought he was being followed by government officials — even testifying that at least 20 times between 2010-12, he thought helicopters flew within feet of his house, nearly landing on his roof.

During his testimony, he admitted he probably imagined the helicopters.

As was true for most of the trial, Casteel remained stoic in the courtroom.

One of Casteel’s first victims was Jennifer Kupiec. She was driving on I-96 in October 2012 when she came up behind Casteel in the passing lane and eventually passed him on the right.

According to Casteel, her tailgating him unleashed “demons” that stemmed from years of paranoia. He aimed out of the passenger window and fired, hitting her car.

“I didn’t see him, so at the time, it didn’t affect me like most people would think it would,” Kupiec said. “But in hindsight … it was pretty scary.”

Kupiec said she still is haunted by the incident.

“There’s not a day that goes by that I don’t think about it,” she said. “I have to take I-96 to work, and I think about it every time I get on the highway.”

For Kupiec and her family, solace could be found in Casteel’s conviction.

“In the end, there are no winners,” said Kelly Kupiec, the mother of Jennifer Kupiec. “His whole family is destroyed. He’s never going to be able to buy his kid a chicken nugget Happy Meal. He’s not going to walk her down the aisle, and that’s what he has to pay for what he’s done.”

Casteel’s attorneys said they were disappointed in the jury’s verdict. Defense attorney Doug Mullkoff said the terrorism charge was contested.

“We contested this because we thought that this was an overcharge,” Mullkoff said.

Casteel is now a convicted felon in both Livingston and Oakland counties and faces sentencing for both cases.

In Oakland County, Casteel was charged with nine felony weapons charges and nine felony assault charges. He pleaded no contest but mentally ill and was ruled mentally fit to stand trial, despite a diagnosis of having delusional disorder.