A man who shot and killed a Planet Fitness employee and wounded his girlfriend in the club's parking lot in San Antonio will be sentenced next month after pleading guilty to murder and aggravated assault.

Yu Masaki entered the pleas in March, according to the San Antonio Express-News. Because Masaki had no agreement in place when he entered the pleas, prosecutors will be able to ask for a sentence of life in prison, according to the newspaper.

The incidents took place in January 2012. Planet Fitness employee Juan Carlos Escamilla was walking with Masaki's girlfriend, Maggie McCombs, in the parking lot. Masaki shot both Escamilla and McCombs, then after reloading his gun, he walked back to his car, saw Escamilla on the ground and shot him again, according to the report. He died at the scene.

A month after the shootings, McCombs, with a tracheal tube still in her throat, was able to mouth to detectives that Masaki was the shooter, the newspaper reported. According to court documents obtained by the newspaper, in a police interview Masaki confirmed, "I was the shooter. I hate her. She broke my heart."

Police said at the time of Masaki's arrest that he had been barred from the gym because of "extremely aggressive advances" toward women there, according to the report.