Singhania also testified that Thomas suffered a complete hemorrhaging of his left eye.
Thomas was beaten by police during the July 5, 2011, incident and died five days later, prosecutors say. The FBI is investigating civil rights violations in the case, as well.
Rackauckas has said that Thomas suffered brain injuries, facial fractures, rib fractures and extensive bruising and abrasions. The county coroner listed his manner of death as a homicide and said he died because he was unable to breathe after having his chest compressed.
Ramos, 37, a 10-year veteran of the police department, would face a maximum sentence of 15 years to life if convicted, authorities said. Cicinelli, 39, a 12-year Fullerton police veteran, would face a maximum of four years in prison if convicted.