One year to the day after Robert Allen was killed inside his family’s business, the Denison Police Department announced Wednesday that it had arrested a suspect in connection with the crime.

Editor's note: This article has been updated throughout. An earlier version of this article erred in stating the day of the indictment. Tyrone Dewayne Sommers was indicted Monday. 

One year to the day after Robert Allen was killed inside his family’s business, the Denison Police Department announced Wednesday that it had arrested a suspect in connection with the crime.

Tyrone Dewayne Sommers, 48, of Sherman, was identified as the suspect in this homicide and was indicted on Monday by a Grayson County Grand Jury for murder and arrested on Tuesday. Sommers is being held at the Grayson County Jail with bail set at $1 million.

The indictment is a formal charge and is not an indication of guilt. The indictment said Allen was killed while Sommers was committing an aggravated assault or deadly conduct and while Simmons was attempting to flee from committing or attempting to commit a felony. Authorities have not released any information about any motive for the crimes.

“I think it is poetic justice that Tyrone Sommers is in just for murder on the anniversary of the homicide,” Interim Grayson County District Attorney Brett Smith said during a news conference Wednesday. Smith commended the work of Denison police, the DA’s office and the Texas Rangers for their assistance on the case.

Officers responded to a report of shots fired at Allen Plumbing on Halloween night last year and, upon their arrival, found Allen, 55, deceased. The Dallas County Medical Examiner’s Office ruled Allen’s death a homicide, but investigators released few details in the year that followed.

Officials announced a standing, $10,000 reward for information leading to an arrest in the weeks and months after Allen’s death, but it wasn’t immediately clear whether the department’s arrest resulted from a public tip.

Denison Police Lt. Mike Eppler said he could not comment on the circumstances of Sommers’ arrest or any existing relationship between Sommers and Allen, citing the now ongoing case.

“Anytime you have an investigation that stretches on; you are looking for information; somebody knows what happened,” Eppler said, regarding the year-long investigation. “You have to interview people, sometimes reinterview people.”

If found guilty, Smith said Sommers faces 15-99 years to life in the prison and a fine of up to $10,000. Smith said the punishment could be enhanced due to Sommers’ previous criminal history. In 1992, Sommers’ was convicted of aggravated assault with a deadly weapon, a felony offense.

Following the arrest, Smith said Sommers will be appointed an attorney and arraignment, and plea dates will be set in coming days.