The associate state medical examiner said Hillary Tyler's infant son's death was a homicide, and it was caused by drowning.
Dr. Jonathan Thompson said he came to that decision based on the examination of the baby's body, as well as Tyler's admission that the baby was crying and moving before she put it in the Super 8 bathtub.
Under cross-examination, Thompson told Joseph McCarville, Tyler's attorney, that without Tyler's testimony, he couldn't determine how the baby died.
Thompson was the prosecution's final witness.
Judge Thomas Bice said court will be in recess until Friday morning, because the prosecution's expert witness will not be available until Friday.
He added the case will hopefully be given to the jury Friday.