A Jefferson Parish grand jury has indicted John Spears on a charge of second-degree murder in the shooting death of his supervisor at a Kenner maritime training center in December.

Spears, 51, of Marrero, is accused of walking into Houston Marine in the 2500 block of Williams Boulevard about 3:30 p.m. Dec. 4 and killing Anthony Tardo.

Police said Spears was standing outside the building shortly before the shooting and told a fellow employee who was leaving early, “You’re going to miss all the fun. I’m about to go back inside and shoot everybody.”

After the shooting, investigators said, Spears told another employee that Tardo “is going to need some help.” He then allegedly went out to his Chrysler 300 sedan, placed the .40-caliber handgun on the roof and waited for police.

Spears had some disputes with co-workers at a prior job, but police and co-workers at Houston Marine said in the days after the shooting that there were no indications of problems there.

Spears is being held in the Jefferson Parish Correctional Center on $750,000 bail.

If convicted, he faces a mandatory life sentence.

The case will be tried in 24th Judicial District Court in Gretna.

Follow Chad Calder on Twitter, @Chad_Calder.