Marlon Ledesma found guilty of beating cellmate to death in Calgary Remand Centre

Ledesma represented himself during the trial but defence lawyer George Sirois was appointed by the court to ensure proceedings were conducted fairly and to question witnesses.

The first attack began at 9:16 a.m. on Sept. 9, 2016, and lasted about two minutes, until Chiniquay appeared to have a seizure or convulsions.

• Video of fatal jail cell beating played at Calgary murder trial

Then Ledesma is shown going after Chiniquay again, this time for about seven minutes. At the end, Chiniquay appears to be unconscious.

The guard who answered Ledesma's call testified the killer told him he was hearing voices.

Chiniquay died days later in hospital.

Mental health concerns

Ledesma's first trial began last September but was derailed over concerns for his mental health. He was later found mentally fit to stand trial.

A sentencing hearing will take place later this year. A second-degree murder conviction comes with an automatic life sentence with no chance of parole for 10 to 25 years.