CHICAGO (STMW) — A married father of six allegedly murdered his friend because he wouldn’t get inside a car after a night of revelry on the West Side.

Gabriel Guardiola even called a mutual friend and left a voicemail declaring what he intended to do to Ricardo Rivera as Rivera walked along the Cicero Avenue early Sunday morning, Cook County prosecutors said.

Rivera called that friend too before proceeding to a parking lot where Guardiola got out of his Dodge Charger and shot Rivera, 31, in the head before driving away, in the 100 block of South Cicero, assistant state’s attorney Stephanie Buck said.

Guardiola, who appeared in court with a Batman shirt Tuesday, was caught firing his weapon on surveillance cameras just moments before he made the ominous phone call, Buck said.

Hours earlier, Guardiola, 36, had picked up Rivera so the pair, who belonged on the same motorcycle club, could go to a strip club, Buck said. After leaving the club, Guardiola, who is nicknamed “Sixto,” got in his car and Rivera walked ahead on the street, apparently irking Guardiola who loudly ordered his pal to get in the Charger, authorities said.

Police allegedly found a gun in Guardiola residence, in the 1500 block of North Monticello. There also was gunshot residue on in Guardiola’s clothing, Buck said.

Guardiola, a custodian for United Building Maintenance, is married and has six children, defense attorney Edward Austin said.

According to a police report, Guardiola is assigned as a custodian at Lane Tech College Prep.

A UBM official said that the company cannot verify employment over the phone and would need the employee’s signature to release any information.

Judge Adam Bourgeois Jr. ordered Guardiola held without bail Tuesday.