The man who mocked the girl singing at the bar killed him with a single punch.

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In the incident that occurred in a karaoke bar in the town of Gorseinon, England, 39-year-old Christopher Cooper killed 64-year-old Kelvin Evans, whom he claimed was mocking him with his girlfriend. The incident was captured moment by moment on security cameras.

The incident took place late at night local time, where Christopher Cooper and his girlfriend were having fun at the karaoke bar. According to Cooper's claim, Kelvin Evans mocked his girlfriend while she was singing. Angered by this, Cooper approached Evans from behind and threw a hard punch.

In the security camera footage, it can be seen that Evans, unaware of the attack, first hit the wall due to the impact of the punch and then fell onto the sidewalk. The 64-year-old Evans, who lost consciousness at the scene, was immediately taken to the hospital but lost his life after a month-long battle for survival.

Christopher Cooper, who admitted his guilt during the trial, was sentenced to life in prison with a minimum of 16 years. Cooper's 54-year-old girlfriend, Catherine Tracy Franscis, who was found to be involved in the incident, also received a two-year prison sentence for aiding the crime.

The presiding judge stated, "This murder, committed in a moment of anger, has darkened a family's life while also ruining the life of the perpetrator. Such incidents once again highlight the importance of anger management," he commented.

The incident also caused great sadness among the local residents. Local residents emphasized that stricter measures should be taken against violent incidents occurring in entertainment venues.