BALTIMORE (AP) — The latest on the trial of a Baltimore police officer who is charged with manslaughter in the death of Freddie Gray, a 25-year-old black man who was injured in the back of a police transport van (all times local).

11:50 a.m.

A Baltimore police officer charged with manslaughter in the death of Freddie Gray says the man showed no physical signs of injury and gave no reason to call for a medic during a van stop.

William Porter testified Wednesday in his own defense. He talked about the fourth stop of the police van carrying Gray. That's where prosecutors say Gray suffered the spinal injury that eventually killed him

Porter said that "after talking to Freddie Gray, he was unable to give me a reason for a medical emergency."

Porter was asked whether Gray said he couldn't breathe at the van stop. He testified, "absolutely not."

When asked why he didn't buckle Gray into a seat belt, Porter said the wagon is "pretty tight." He said he's been a part of about 200 arrests involving wagon transport and no prisoners were belted in.

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10:50 a.m.

A Baltimore police officer charged with manslaughter in the death of Freddie Gray has taken the witness stand to begin testifying in his own defense.

Officer William Porter was the second witness called by the defense. Prosecutors say Porter failed to call for a medic after Gray said he needed one and the officer didn't buckle Gray into a seat belt when he was riding in the back of a police wagon.

Defense attorneys have tried to suggest that the van driver was responsible for Gray's safety. They have also said Porter acted the way any reasonable officer would have and suggested that the officer may have thought Gray was faking an injury to avoid going to jail.

Gray injured his spine in the back of the police wagon and died a week later.

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10:30 a.m.

A defense witness testifying in the trial of a police officer charged in Freddie's Gray death has been a witness in several other high-profile trials, including the acquittal of George Zimmerman.

Dr. Vincent DiMaio was the first witness called by the defense on Wednesday in the trial of Officer William Porter.

DiMaio testified on behalf of Zimmerman, Phil Spector and Drew Peterson.

In the Zimmerman case in Florida, DiMaio said Trayvon Martin's injuries suggested he was on top of and leaning over Zimmerman when Zimmerman fired his gun, killing the unarmed black teenager.

Peterson, a former police officer in Illinois, was convicted of killing his third wife, although DiMaio testified she died as a result of a fall in a bathtub, not an assault.

Music producer Spector was convicted of killing an actress despite DiMaio's testimony that she shot herself.

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10:15 a.m.

Defense attorneys have called a forensic pathologist as their first witness in the manslaughter trial of a Baltimore police officer charged in the death of Freddie Gray.

Dr. Vincent DiMaio took the stand Wednesday morning at the trial of Officer William Porter.

The pathologist says he disagrees with certain interpretations of the autopsy findings, including the timing of Gray's fatal injury.

Maryland Assistant Medical Examiner Dr. Carol Allan testified for the state that Gray's neck was most likely broken between the second and fourth stops of a ride in a police van. Gray was handcuffed and shackled, and unrestrained by a seat belt while in the van.

The defense contends the van driver, not Porter, was responsible for ensuring Gray's safety.