YOUNGSTOWN — Katrina Layton, 37, a co-defendant in the murder of Shannon Graves that sent Arturo Novoa, 33, to prison for 48 years, returned to custody in the Mahoning County Justice Center Monday.

A judge ruled that she had violated the terms of her bond.

Judge Anthony Donofrio last week ordered Layton to turn herself in at the jail and remain there unless she could post $20,000 bond.

The judge ordered the $20,000 bond after a hearing in December in which a special prosecutor alleged Layton participated in 37 phone calls with Novoa while he was in prison — despite being ordered to have no contact with him.

Layton admitted to witnessing the murder, allowing Graves’ body to be dismembered in Layton’s garage, and to helping move the body.

Youngstown police detectives and the coroner said Graves was killed at her Mahoning Avenue home when she was struck in the head several times with a heavy object.

Layton was indicted on a murder charge in the case but pleaded guilty Feb. 18, 2018, to obstruction of justice and abuse of a corpse. She agreed to testify truthfully at the trial of Novoa and other co-defendants. She was allowed to leave jail on a personal recognizance bond after the plea.

Meanwhile, a two-day hearing is planned for Thursday and Friday to determine whether her guilty plea to lesser charges should be revoked on the grounds that she did not testify truthfully about the case.