WILLIAMSON COUNTY, Texas (KXAN) — The Williamson County Sheriff’s Office made an arrest on Aug. 13 in the murder of a 70-year-old Florence grandmother. Investigators said they believe this was an “unprovoked” and “random” act of violence.

Joshua Anthony Gilbreath, 26, was arrested and charged with murder in the death of Diana Lynn Pier after she was found shot to death. His bond was initially set at $1 million, then lowered to $250,000.

Gilbreath bonded out of jail on Dec. 13.

The sheriff’s office said Gildbreath was found by the U.S. Marshals Office in Round Rock Aug. 13, and he was turned over to the Williamson County Sheriff’s Office around 3 p.m., a release said.

“The Williamson County Sheriff’s Office appreciates the support that the Williamson County community has shown towards the solving of this tragic crime,” said Commander John Foster with the Williamson County Sheriff’s Office criminal investigations division.

The week prior to Gilbreath’s arrest, Pier’s family and police held a news conference where they asked for the public’s help with finding the person responsible for Pier’s death.

Investigators said they believe Pier drove home from meeting a relative in Round Rock, and they believe Pier may have stopped to help someone on the road before the shooting.

Pier’s husband and two daughters held up a photo of the smiling grandmother throughout the news conference. Marsha Garcia, Pier’s daughter, told reporters their family “now has a void that cannot be filled.”

Gilbreath did not have an attorney listed in court records. This story will be updated if an attorney is later added and provides a statement.