Convicted double-murderer Craig Wall continued presenting evidence in the sentencing phase of his murder trial, which wrapped up Friday.

Wall was convicted last week of killing both his girlfriend, Laura Taft, and the couple's 5-week-old son. He has been representing himself in the penalty phase of the trial

On Friday, Wall presented more home videos and called more witnesses in the sentencing phase of his murder trial Friday. He showed home video of the birth of Craig Wall Jr., which he described as the single happiest moment of his life.

"I love my family, I try to provide for them and give them a safe home," Wall said. "I did not kill my son."

However, Chief Medical Examiner Dr. Jon Thogmartin testified injuries causing the 5-week-old baby's death were abusive in nature.

"This is an inflicted injury by a person," he said.

Wall asked Dr. Thogmartin if his son would have experienced any pain. The doctor said he couldn't say.

"I don't know what happened to my son," Wall said. "I want to know and these people can't tell me. I asked the Chief Medical Examiner, he can't tell me."

Wall also called a friend to the stand and a pet store manager, where Wall says he purchased his dog.

Wall has admitted to killing his girlfriend and wants the death penalty.

"It's something I deserve," said Wall. "You're supposed to protect females and children, you're not supposed to kill them."

Taft's parents have been in the courtroom everyday.

"These people have a right to watch me die," said Wall.

"All I have is this scumbag life right here, you understand," said Wall. "All I have is this, so I can't give them back their daughter but I can give them peace of mind.

"I'm gonna choose 'Old Sparky' because I think it would give them more pleasure to watch me at least look like I'm suffering."

As part of the sentencing phase, Wall was required to present mitigating factors - reasons why he should not get the death penalty. Judge Phil Federico appointed independent special counsel to review whether any other factors need to be included.  A status hearing is scheduled for April 10.

Ultimately, Judge Federico will decide if Wall will get the death penalty. That decision could take weeks, or even months.