A Florida man convicted of killing his estranged wife’s sister and parents before setting their house on fire 35 years ago will be put to death next month, which could extend the Sunshine State’s record number of executions to 12.

David Pittman, 63, is set to be executed on Sept. 17 under a death warrant signed by Republican Gov. Ron DeSantis on Friday.

Pittman was convicted in 1991 and sentenced to death on three counts of first-degree murder, as well as arson and grand theft, after the killings that were carried out the year before.

Pittman is set to be the 12th person put to death in Florida this year, including Kayle Bates and Curtis Windom, who are scheduled for execution later this month.

David Pittman will be the 12th person to be put to death in Florida this year. (AP Photo/Sue Ogrocki, File)

Florida has executed more people this year than any other state, with 9 after an execution in July. Texas and South Carolina are tied for the second-most with four each.

Before this year, Florida’s previous record for executions in a year since the death penalty was restored in 1976 was eight in 2014.

The Associated Press contributed to this report.