A Chantilly man has pleaded guilty to second degree murder for killing his father during a 2011 domestic dispute, as part of a deal with prosecutors in Fairfax County, his public defender said.

Gbassay Koroma, 19, had been facing a first degree murder charge, but the Fairfax County Commonwealth’s Attorney’s office agreed to reduce the charge in exchange for a guilty plea, said public defender Robert Frank.

Koroma was arrested in May 2011 after police found his 40-year-old father, Francis Koroma, suffering from a stab wound in the abdomen inside the family’s apartment in the 5100 block of Woodmere Drive.

The father was transported to the hospital, where he later died.

Frank said the younger Koroma stabbed his father following an argument in the apartment, where both lived with Francis Koroma’s girlfriend.

Frank said Francis Koroma was upset that his son did not clean up the apartment after a vacuum cleaner broke and became abusive. Sometime after the father and son clashed, Gbassay Koroma picked up a knife and stabbed his father, Frank said.

Gbassay Koroma had a long history of mental health issues, but was declared competent to stand trial, Frank said.

Koroma is scheduled to be sentenced on June 8.