GERING, Neb. (AP) — A 24-year-old man who said a drug addiction led him to tie up and rob his grandparents earlier this year has been sentenced to six to 10 years in prison.

Levi Hartman was sentenced in Scotts Bluff County District Court on Monday. Hartman had pleaded guilty in August to attempted robbery in a deal with prosecutors, who had originally charged him with robbery.

Police say John and Marsha Hegwood interrupted the robbery on May 24. Marsha Hegwood told officers that she was sprayed with pepper spray, and John Hegwood says one of the two robbers knocked him down. The other robber turned out to be a 16-year-old.

The Hegwoods were tied up and had two vehicles, cash and credit cards stolen.