A former medical examiner says a laceration on the left hand of a young woman could have been caused by her pounding on the door at a Detroit-area home before the owner killed her.

Live updates: Day 6 of porch shooting trial

Dr. Werner Spitz is testifying for the defense Thursday in the trial of 55-year-old Theodore Wafer. He is charged with second-degree murder in the fatal shooting of 19-year-old Renisha McBride.

Spitz said no evidence supports that McBride's hand was injured in a car crash which occurred just hours before her death.

"We have a small laceration that's oozing blood. We have her banging on the windows and the doors and the whatever, so do I need to go looking for some strange, fictitious event? No I don't. That's not how I practice," he said.

Wafer killed McBride on his porch before dawn last Nov. 2. Wafer is claiming self-defense, but prosecutors say he could have settled the situation by keeping the front door closed and calling police.

Wafer's attorneys haven't said if he will testify, but legal experts believe he must if he wants to show jurors that he reasonably acted out of fear.