OLEY TWP., Pa. -

A Berks County man was ordered Wednesday to stand trial in the death of East Penn Manufacturing CEO Sally Miksiewicz.

Mark Miller appeared before a district judge in Oley for his preliminary hearing on charges of homicide by vehicle while DUI, driving under the influence of alcohol or controlled substance, involuntary manslaughter and related offenses.

"Obviously, it's an issue where he should not have been behind the wheel," said Berks County Assistant District Attorney Justin Bodor.

Miller, driving his truck at more than twice the speed limit, was under the influence of marijuana and numerous prescription drugs when he struck and killed Miksiewicz as she jogged near her home in Pike Township on the morning of June 20, state police said.

"We believe that the DUI was the cause, but also it's clear that he was driving in a reckless manner," said Bodor.

In the courtroom Wednesday, Pennsylvania State Police investigators, appearing before Judge Victor M. Frederick, testified that Miller was out-of-sorts on-scene and was ultimately unable to explain what had led to the crash.

Trooper Brian Jasinski told the courtroom that Miller had initially appeared "fidgety, nervous [and] anxious" on-scene, and later became agitated, uttering phrases like "help me, God."

In the courtroom, Miller sat silently next to his defense attorney, Christie Billman. His leg was visibly trembling for most of the hearing.

Sitting in on the hearing were family and coworkers of Miksiewicz, who had no comment for 69 News.

"Certainly, this is a tragedy for everybody in Berks County. I can't speak to what [family] would say, but clearly, a tragic, tragic case," said Bodor.

Miller remains in the Berks County Jail on $500,000 bail. His formal arraignment is scheduled for Sept. 11.

East Penn, headquartered near Lyons, was founded by Miksiewicz's father, DeLight Breidegam Jr., in 1946. It has since grown to become one of Berks County's largest employers.

Daniel Langdon, who joined East Penn as controller in 1986, was recently named the company's new CEO.