Published: Jan 13, 2014 7:09 PM EST
Updated: Jan 13, 2014 7:10 PM EST

FORT MYERS, FL - Trial is underway for a man accused of stabbing a woman to death in her Cape Coral apartment more than five years ago. Andrew Castor allegedly confessed to investigators that he killed 21-year old Bianca Interiano on August 2, 2008.

During opening arguments Castor's defense attorney, Terence Lenamon, said there's no question his client did it, it's a matter of whether or not he was insane at the time.

Lenamon says "I told the jury, as I had done throughout jury selection, that my client killed this young woman." He goes on to say, "it wasn't an issue of whether he killed her or not, it was all an issue of his state of mind at the time, so we raised the defense of insanity and we plan on putting that forth with the evidence from a psychiatrist from Tampa."
Lenamon says it took four days to pick a jury last week because of the insanity defense.

On Monday, the 14 jurors heard testimony from several witnesses. Most of them were officer with the Cape Coral Police Department that first responded to the scene. They all testified there was a broken window that they could see lots of blood inside and a females body.

Soon after, a detective found the victims car in an alley behind a nearby Circle K. It had no license plate on it and there was broken pieces to the border of a license plate on the ground. The keys to the car were also on the ground, surrounded by a trail of footprints.

Forensic experts were called in to take pictures of both crime scenes. Lawrence Stringham, a Forensic supervisor with the police department, says he also got surveillance video from a nearby business.

Castor faces life in prison if convicted. He's charged with murder, burglary, and grand theft.

Lenamon says the trial is expected to wrap up by the end of the week. "I anticipate the states case will probably be done late tomorrow or sometime Wednesday and then it is our burden to prove by convincing evidence that he was insane at the time and we intend to prove that burden" says Lenamon.

Interiano's family was inside the courtroom. They were visibly upset by some of the testimony. They told me they are not commenting about the trial at this time.