UPDATE: The man accused of shooting at passing cars near Exit 11 has Post-Traumatic Stress Disorder or PTSD. That's what he told police Thursday while being taken into custody. 

Friday Mathew Henry is charged with reckless endangerment, and remains in the Hamilton County Jail.

Police say Mathew Henry served two tours in Afghanistan.

Mathew Henry told police he ran out of medicine to treat his PTSD. “The medication does work to help a person deal with the symptoms. It does not help them actually work through the trauma and move past that.”

Kelsey Dupree is a social worker with Parkridge Valley. She said PTSD is common, and like many mental health disorders, there are different levels of severity. “The event playing over in your mind as it is real. The smell, the smell that was there. Feel the feelings you felt. Hear the sounds that were there.”

More than three million people are diagnosed with PTSD each year in America. It is even more common in veterans. Eleven percent of veterans who served in Afghanistan have PTSD.  “Close encounter with death, death of a close friend or relative. Of if we are in a place where our bodies are feeling we are personally harmed and violated.”

While medication may help in the short term, Dupree said therapy is key. “It is not that it is all better or it goes away, but you can deal with life a little better.”

No one was injured Thursday and no vehicles were damaged. Mathew Henry's court appearance will be November 14th.

He's charged with reckless endangerment.

PREVIOUS UPDATE: Authorities arrested a Hamilton County man Thursday evening after he fired a shotgun at passing vehicles.

The arrest affidavit says that Matthew D. Henry told police that he suffered from PTSD (Post-Traumatic Stress Disorder) and had run out of his medications.

Henry told police he used the shotgun to hunt coyotes.

Police found spent shell casings at the site where Henery was said to have fired his shotgun at passing cars on Interstate 75, near Exit 11.

He was arrested at his Ooltewah home after a relative drove him home following the incident.

Henry has been charged with reckless endangerment.

PREVIOUS STORY: A man is in jail Thursday night, accused of standing on an interstate overpass and firing a gun at passing cars.

No one was injured.

A nearby daycare was on lockdown while police searched for the shooter, who was identified using surveillance cameras in the area.

It was about four hours from the time the first 911 call came in until police arrested Matthew D. Henry a few miles from where the shots were fired.

He was shirtless, wearing camouflage and carrying what eyewitnesses described as a shotgun.

These are the images caught on camera near the Interstate 75 Exit 11 overpass, where Matthew Henry is accused of shooting at passing cars.

"I felt safe. Where I work we don't have locked doors but after this incident we work where it could be easy to get in there," said Lisa Cate, who works nearby.  "I think it's a good idea for a lot business especially locally if you work near the interstate things like that could happen."

Cate didn't hear the shots, but heard police were searching for a man. Her child's daycare went on lockdown and alerted parents by email.

Henry was easily identifiable by the photos. Police knew who they were looking for and located Henry just a few miles from the overpass.

The daycare stayed on lock down even after the scene was clear. 

"It was definitely different," Cate said. "I called ahead of time and they did tell me that they would bring my child out. Usually I have a code and I get in, but today was different."

Henry has been charged with reckless endangerment and is currently being held without bond at the county jail.  His court appearance will be November 14th.