Brad Cascio is set to become the next district attorney for Livingston, Tangipahoa and St. Helena parishes after defeating Sherman Mack in Tuesday's election, sweeping all three parishes in the 21st Judicial District. Cascio, who has served as an assistant district attorney in the district, will take over an office long held by one man as voters delivered their first genuinely contested race for the seat in three decades.
A Sweep Across Three Parishes
Cascio took 64% of the vote in Livingston Parish, 66% in Tangipahoa Parish and 54% in St. Helena Parish, according to The Advocate. The paper reported that Cascio will take over the 21st Judicial District Attorney's Office after defeating Mack on Tuesday. Both men ran as Republicans in a contest the outlet described as contentious.
As Livingston Parish News reported, Cascio pulled in roughly 65% of the districtwide vote to Mack's 35%, with turnout across the 21st Judicial District landing at 46.6%. Parish-level turnout varied slightly, with Livingston Parish at 47.5%, Tangipahoa Parish at 45.5% and St. Helena Parish at 46.7%, per the same outlet.
End of an Era for the DA's Office
Cascio is an assistant district attorney for the 21st Judicial District and will succeed his boss, District Attorney Scott Perrilloux, who is stepping down after three decades in the role, The Advocate reported. Perrilloux had served as district attorney since 1996 and announced in September 2025 that he would not seek reelection, according to WAFB. The station reported that the winner will become the top prosecutor for Livingston, St. Helena and Tangipahoa parishes when Perrilloux's term ends in January 2027.
That long tenure is part of why this race stood out in the first place. The Advocate's reporting noted that the contest marked the district's first competitive district attorney race in 30 years, a dry spell that made Tuesday's sweep notable even before the vote totals came in.
Big-Money Race for a Rarely Contested Seat
The scale of spending matched the rarity of the contest. The Advocate reported that nearly $1 million was raised between Cascio and Mack, while WAFB separately reported that campaign contributions and spending in the race exceeded $900,000. An earlier report from the same Advocate coverage had described the matchup as Louisiana's second most expensive district attorney's race, though that comparison was not independently verified by other reporting reviewed here.
With the results in, Cascio now heads toward a January transition into an office that has had just one leader for thirty years. His path there ran through all three parishes of the 21st Judicial District, each of which broke decisively in his favor on Tuesday.
