UPDATE: Tan was sentenced to 20 years in prison for federal gun charges.

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Charles Tan is set to learn his fate Monday as he is sentenced on gun charges connected to the murder of his father in Pittsford in 2015.

Tan was arrested last year on the gun charges, nearly two years after murder charges against him were dismissed.

Prosecutors said Tan had a friend illegally purchase the gun used in the deadly shooting. Earlier this year, Tan pleaded guilty in the case and now faces up to 25 years behind bars.

Federal prosecutors have urged the judge to give Tan the maximum sentence. However, in court documents, defense attorneys pleaded for a lighter sentence of just five years.

In other documents, Tan also tried to explain why he shot and killed his father. In a letter to the judge, Tan blamed escalating abuse by his father, saying he felt he had no other way to protect his mother.

However, Tan now admits he acted on “impulse” and made a “series of immature and irrational decisions.”

Sentencing is set to begin at 2 p.m. in federal court in Syracuse.