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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.

FLORIDA BREAKS 50-YEAR EXECUTION RECORD WITH NINTH DEATH SENTENCE CARRIED OUT THIS YEAR

Pittman and his wife, Marie, were going through a divorce when he went to the home of her parents, Clarence and Barbara Kn

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