Published: Oct 21, 2010 7:22 PM EDT
Updated: Oct 21, 2010 4:22 PM EDT

JACKSONVILLE, Fla. (AP) - A Jacksonville man will spend the rest of his life in prison for the killing of a Sudanese refugee with a hammer during a September 2009 robbery.

Merlin Williams Jr. was sentenced Thursday, as was Ashley Nichole Jerrell. She was sentenced to 25 years.

Authorities say Williams and Jerrell stole 37-year-old Isaac Siliman's credit cards, computer and car after attacking him with the hammer, a stun gun and pepper spray.

As part of a deal with prosecutors, Jerrell pleaded guilty earlier this year to second-degree murder and agreed to testify against Williams. Williams was convicted of murder last month.

Williams' attorney says it was a tragic case for everyone involved.