GONZALES — All four people charged with luring a man with the promise of buying drugs and then beating him unconscious and robbing him have now pleaded guilty to charges in the case, prosecutors in Ascension Parish said Friday.

Two of the defendants who pleaded guilty this week, David Gonday and Heather Firmin, received sentences of 15 and 6 years respectively, prosecutors with the 23rd Judicial District said in a statement.

The third defendant, Richard Allen, won't be sentenced until 1 p.m. Oct. 9, court minutes say, but he has agreed to 15 years in prison under his plea deal.  

The severely beaten man was found on June 11, 2017, locked in the trunk of his car in a grassy area along the La. 70 service road near Convent after St. James Parish sheriff's patrol deputies had heard moaning sounds from the abandoned vehicle, prosecutors said.

After a joint investigation by St. James and Ascension sheriff's deputies, investigators uncovered the planned kidnapping, beating and robbery.   

Investigators found Firmin, 41, 42361 Moody Dixon Road, Prairieville, had called and lured the victim to Allen's home in Sorrento to buy drugs.

Instead, Gonday, Allen, and the fourth defendant, Dustin Eddy, beat and robbed him while Firmin watched, a plea agreement says.

The series of pleas before 23rd Judicial District Judge Thomas Kliebert Jr. came Monday in Gonzales about two weeks after Eddy reached a plea agreement with prosecutors in exchange for his testimony against the other three defendants. 

Eddy, 37, 601 Bourg St., Donaldsonville, received a 13-year prison sentence Aug. 27 after pleading guilty to counts of attempted second-degree murder and second-degree robbery, prosecutors said.

On Monday, Gonday, 35, 43464 Norwood Road, Prairieville, pleaded guilty before Kliebert to counts of attempted first-degree murder and second-degree robbery, prosecutors said.

Also on Monday, Allen, 55, 6100 Panama Road, Sorrento, pleaded guilty to counts of second-degree robbery and second-degree battery. Firmin pleaded guilty Monday to being a principal to second-degree battery.

Follow David J. Mitchell on Twitter, @NewsieDave.