The Mobile Press-Register reports Kenneth Dewight Smith was slated for trial this week before entering his plea Thursday in Baldwin County Circuit Court.
The 20-year-old faced 28 counts including robbery, kidnapping and burglary, but pleaded to one count of first-degree robbery.
In exchange, the remaining charges were not prosecuted.
Authorities say he was one of five men accused of bursting into a party in the Lake Forest community in June 2010, where people inside were allegedly using a form of Ecstasy.
Two other suspects have pleaded guilty and a third is expected to enter a plea next week.
(Copyright 2011 by The Associated Press. All Rights Reserved.)