Waseem Daker, convicted on Friday of strangling Karmen Smith and stabbing her son in their East Cobb home in 1995, will serve life plus 47 years.

That's the sentence handed down Monday morning by Cobb Superior Court Judge Mary Staley, who told Daker he had committed "untold evil."

According to The Atlanta Journal-Constitution, Daker protested his innocence after the sentencing.

Daker was a Georgia Tech student at the time prosecutors say he killed Smith, a flight attendant for Delta Air Lines, and stabbed her son, Nicholas Smith, at the time a student at Timber Ridge Elementary School, a total of 16 times.

He survived the attack and now at the age of 22, was a key witness for the prosecution.

Daker, now 35, served as his own attorney during the trial, which generated national media interest.