Victor Castigador was serving a whole-life sentence for tying up and setting alight two security guards at an amusement arcade in London
A prisoner has admitted murdering a fellow inmate by hitting him with a rock from a fish tank.
Victor Castigador, 61, killed Sidonio Teixeira, 59, at HMP Long Lartin in Worcestershire on June 20. The rock was hidden in a sock, it is understood.
Castigador is serving a whole-life sentence for tying up and setting alight two security guards at an amusement arcade in London.
Teixeira was serving a life-term for murdering his three-year-old daughter.
More on this and other stories Herefordshire and Worcestershire
Castigador, who pleaded guilty to to killing Teixeira when he appeared at Worcester Crown Court, will be sentenced on 21 October.
He was given a minimum term of 25 years for the murder of the security guards in 1989 before his sentence was later increased to a whole-life order by the home secretary.
Teixeira's death is the subject of an investigation by the Prisons and Probation Ombudsman.
He was the third inmate to be killed by fellow prisoners at Long Lartin, a Category A jail, since 2013.
- Published22 June 2016
