A 16-year-old who stabbed and killed a man earlier this year to rob him of $3 was convicted of murder Wednesday.

Thomas Partlow was one of three teens involved in the death of 49-year-old Grady Williamson, who was robbed on Oakhurst Avenue in January. He died at a hospital the next day.

Gibson Wright III, 17, and Marvin Clark, 15, each pleaded guilty to second-degree murder and robbery in July. Wright was sentenced to 30 years in prison and Clark received a 25-year sentence.

Prosecutors said Williamson was a random robbery target. Police said the teens decided to rob Williamson for gas money.

Partlow faces life in prison when he's sentenced in October.