The jury was given copies of notes made by Dr. Joseph Lee, the cardiologist who treated Ritter at Providence St. Joseph Medical Center in Burbank.
Ritter's family is seeking $67 million in damages from Lee and a radiologist.
The lawsuit claims the radiologist failed to spot an enlarged aorta after giving the actor a body scan two years before his death and that the cardiologist committed malpractice after Ritter was brought to the emergency room.
Ritter was diagnosed with a heart attack but actually died from a torn aorta.
The doctors' lawyers told the jury in closing arguments that the physicians did nothing wrong.