Alfredo Mendoza was declared dead on arrival at the Western Batangas Medical Center due to gunshot wounds in the body.
Mendoza was walking in Barangay Dao, Balayan town when he was killed at around 9:30 p.m.
Police have yet to identify the assailants and determine the motive for the killing.
In Cavite, Jerime Villanueva was having a drinking spree with his three friends when he was killed in Barangay Lalaan 1, Silang town.
Police arrested the suspect, identified as Jonie Olaco, in a follow-up operation.
In nearby Dasmariñas City, Jay Allen del Rosario was shot dead by two unidentified men as he was walking in Barangay Sampaloc 4.
Del Rosario was declared dead on arrival at a hospital.