JACKSONVILLE, Fla. -

The man convicted of killing over what he thought was his stolen driver's license was sentenced on Wednesday to spend the next 40 years in prison.

A jury found Kenneth Worthen guilty of second-degree murder in December for the 2005 stabbing death of 28-year-old David Taylor.

Police said Worthen stabbed him because he thought Taylor picked up his ID from a convenience store parking lot and took off. However, it turned out that what Taylor had picked up the night of his death was a $20 bill.

Wednesday was an emotional day in court for family members of Taylor as they took the stand during Worthen's sentencing hearing and relived the day their loved one was murdered.

Taylor's mother, Rebecca Tucker, fought back tears as she described the impact Worthen's actions have had on the victim's young son.

"Without mercy, having no regret and totally devoid of shame, Worthen mutilated Shad's heart," Tucker said on the stand.

Taylor's family members said they do not think Worthen's 40-year sentence is justice served.

"We were hoping for life in prison because we feel like if he gets out, he will kill again. He got 40 years. There's not really a whole lot we can do about it. We were hoping for life," Tucker said.

Channel 4's Scott Johnson, who was in court for the sentencing, reported that Worthen will have to serve at least 85 percent of his sentence.