The bank robbery case against a retired Dayton police detective was bound over Friday to a Guernsey County grand jury after David M. Hirst waived his preliminary hearing.

Hirst, 49, remains in jail on a $1 million bond, following the robbery Nov. 1 of the downtown branch of U.S. Bank. A grand jury is expected to meet in early December, said Prosecutor Daniel Padden.

Hirst’s attorney, Nicholas Gounaris of Dayton, declined to comment on the case. “We haven’t seen the police reports or any of the evidence,” he said, adding that his client is faring well in jail.

Clad in an orange jumpsuit, his hands shackled to his waist, Hirst nodded to his wife when she quietly asked if he was OK. His wife, Kay Hirst, declined Friday to comment.

Hirst retired from the Dayton department in November 2011 after 25 years. He was twice commended for arresting bank robbers and had no written disciplinary measures when he retired, according to his personnel record.

“It’s still a mystery,” Cambridge police Capt. Randy LePage said when asked if police had established a motive. LePage did say that Hirst told police he had been in the Guernsey County before many years ago, camping with his children.

According to Cambridge police, Hirst entered the U.S. Bank, adjacent to the county courthouse, around 12:45 p.m. on Nov. 1. He handed a teller a note demanding cash, took the teller into the vault, then fled out the back door with an undetermined amount of cash.

Hirst was confronted in the bank parking lot by a Cambridge officer, responding to a 911 call from inside the bank. Hirst — armed with a loaded .40-caliber Glock and .380-caliber Ruger handguns — was taken into custody without incident.

“He was only inside the bank for a short time,” Capt. LePage said, following Hirst’s brief appearance in Cambridge Municipal Court. “The officer had quickly responded to the bank and was in position to make the arrest.”

Padden said jurisdiction of the case — whether Hirst will be tried in federal or state court — is still being decided. Hirst faces a possible 3 to 10 years in prison if convicted in state court or up to 25 years if convicted in federal court.