Lee, 51, was administered the lethal injection at 11:44 p.m. local time on Thursday (12:44 a.m. ET). He was pronounced dead 12 minutes later.
His execution was Arkansas' first since 2005. The state had planned to execute eight inmates over 10 days starting April 17, saying its lethal-injection drugs will expire at the end of the month. Four of the men have received stays for various reasons.