Prison tutor admits misconduct after relationship with inmate at HMP Chelmsford
Oksana Antanaitiene sent sexually explicit images and messages to a serving prisoner
A prison tutor has admitted misconduct in a public office after forming an inappropriate relationship with an inmate.
Oksana Antanaitiene was already under investigation when she was found in a locked office at HMP Chelmsford with a serving male prisoner in August 2025.
The investigation subsequently showed she had communicated with the man sexually by letter and by phone, and had sent him sexually explicit images, police said.
Antanaitiene's role at the prison was as a maths tutor, and she had undergone two separate training sessions relating to safety in prison, corruption prevention and delivering teaching within a prison setting.
The inmate's cell was searched on 22nd October 2025, during which explicit images of a woman were found, along with a USB device located in a dressing gown.
During an internal meeting the following day, Antanaitiene admitted forming the inappropriate relationship and sending photos to the inmate.
She also admitted giving him music and TV files contained on the USB drive.
Officers also found other items of significance during searches of a vehicle and a property connected to Antanaitiene, police said.
Antanaitiene, 51, of Bradleigh Avenue, Grays, was charged with misconduct in a public office in July 2026.
She appeared at Chelmsford Crown Court on Tuesday 22nd September, where she admitted the offence.
She was released on bail ahead of a sentencing hearing at the same court on 28th October.
DC Matthew Parker, of the Prison Investigations Team, said Antanaitiene "held a position of trust within the prison environment and was fully aware of the professional standards and boundaries expected of her".
"Instead, she chose to enter into an inappropriate relationship with a serving prisoner and continued that relationship through repeated contact and the sharing of prohibited items and explicit material," DC Parker said.
"Her actions undermined the integrity of the prison system and had the potential to compromise the safety and security of the establishment," he said.