The Patriots (14-4) fell to host Biloxi before beating Gautier later Thursday.
Starkville High School has three players competing, Columbus High School has two, and New Hope High School has one.
Three runs in the top of the seventh made the difference as the Trojans withstood a late comeback.
Carter won four state championships in his 19 years at Starkville, going all the way in 2010, 2015, 2019 and 2020.
Hunter Carr drives in three with first-inning double as New Hope baseball hands Caledonia first loss of season
Carr’s bases-clearing double in the first inning helped pace the Trojans to a 12-3 win, avenging Thursday’s home loss to Caledonia.
The Panthers reached the title game for the first time since winning the 2004 state championship.
The Cavaliers held the Trojans to two hits in the 6-4 win.
All five Panthers starters Monday were seniors, while the Lions fielded a quintet of sophomores.
The Panthers can win their second state title ever and first since 2004 by beating Ingomar on Thursday.
The Rams still reached the state title game for the first time in school history.