STARKE, Fla. (AP) — Florida on Thursday put a man to death with an anesthetic never used before in a U.S. lethal injection, carrying out its first execution in more than 18 months on an inmate convicted of two racially motivated murders.

Authorities said 53-year-old Mark Asay, the first white man executed in Florida for the killing of a black man, was pronounced dead at 6:22 p.m. Thursday at the state prison in Starke. Asay received a three-drug injection that began with the anesthetic, etomidate.