Brian Trainor, chief deputy of the St. Tammany Parish Sheriff’s Office, Covington lawyers Warren Montgomery and Roy Burns qualified Wednesday to run morning to run for the 22nd Judicial District Attorney, which covers St. Tammany and Washington parishes.

Trainor and Montgomery, whose candidacy only became public Tuesday, qualified in the morning, and Burns filed his papers in the afternoon. Alan Black, a Slidell lawyer who has announced plans to run, has not yet qualified.

Walter Reed, who is under investigation by a federal grand jury, announced last month that he would not seek a sixth term, setting off the race to succeed him.

All judgeships in the 22nd Judicial District are also up for election, and as of noon, several incumbents had qualified but no challengers. They are Peter Garcia, Division D; William Burris, Division E; Martin Coady, Division F; Allison Hopkins Penzato, Division H; Reggie Badeaux, Division I; William “Rusty’’ Knight, Division J; and Mary Devereaux, Division K.