Laid to Rest

A young woman with amnesia breaks out of a coffin in a funeral home, and dials 911 in the morgue, but accidentally unhooks the telephone while speaking to the operator. The mortician appears, and is impaled by a man equipped with a chrome skull mask, and a shoulder mounted camera. The girl stabs ChromeSkull in the eye, and runs off while he treats his wound. The girl is picked up by Tucker, who takes her home to his wife Cindy, and promises her that they will go to the sheriff's station in the morning, as Tucker's truck is low on gas, and their phone service has been cut off.
ChromeSkull tracks the girl (who has been nicknamed "Princess") to Tucker's house, and kills Cindy. Tucker and Princess escape in Tucker's truck as ChromeSkull deals with Cindy's brother Johnny and his girlfriend, who had come by to check on Cindy. Tucker and Princess seek aid from a recluse named Steven, who uses his computer to email for help, and research ChromeSkull, discovering he is a serial killer whose modus operandi is to send tapes of himself murdering women to the authorities.
The trio go to the police station, and find the sheriff and a deputy dead, and ChromeSkull waiting for them. The group wound ChromeSkull's leg, and drive away, reaching the funeral home. Princess explores the area, and discovers that a nearby barn contains several of ChromeSkull's previous victims. ChromeSkull beheads a still-living captive, knocks Princess out, and places her in a casket. Before ChromeSkull can kill Princess, he is shot by Tucker, who drives away with her and Steven in ChromeSkull's car.
Princess looks at footage on ChromeSkull's camera, which shows he was in league with the mortician, who he killed due to the man becoming a liability. Princess takes the car while Tucker and Steven are removing bodies from the trunk, and is locked inside by ChromeSkull, who uses his cellphone to take control of the onboard computer as he follows Princess to a convenience store. Via paperwork in the car, Princess finds out ChromeSkull's name is Jesse Cromeans, right before he attacks her.
ChromeSkull prepares to kill Princess, but he is out of tapes for his camera, so he coerces her into going into the store to get one. The clerk sees the threatening messages ChromeSkull is sending Princess through a cellphone, goes out to confront him, and has his head blown off when ChromeSkull turns his own shotgun on him. A customer goes to lock the backdoor, and is decapitated by ChromeSkull. Tucker and Steven reach the store, grab ChromeSkull's suitcase on the way in, and replace the glue he uses to keep his mask on with Cyanoacrylate. ChromeSkull cuts the power, and causes Steven's face to explode by injecting Canned tire inflator into his ear. Tucker is stabbed while trying to give Princess enough time to escape with Tommy, the murdered customer's friend.
ChromeSkull locks Tommy out of the building, and traps Princess in a freezer. To taunt Princess, ChromeSkull gives her his camera, which reveals she was a drug addicted prostitute he had picked up, and that she lost her memory when ChromeSkull beat her with a bat. Princess smashes the camera in frustration, and while struggling with ChromeSkull, knocks his mask off. ChromeSkull goes to reaffix his mask, unknowingly using the Cyanoacrylate that Steven had replaced his adhesive with. The chemical melts ChromeSkull's face, and as he writhes in agony, Princess bludgeons him with an aluminum bat.
Princess finds her missing persons notice (which Steven had printed off his computer) in Tucker's pocket, and leaves with Tommy. The police arrive, and find the flyer, which Princess had written an explanation on the back of.

Question: Who sees ChromeSkulls threating messages
Answer: Clerk