A Woodbridge man pleaded guilty Monday to involuntary manslaughter in connection with a February car crash that killed a deputy director of a defense intelligence agency.

Carlos Edgar Portillo, 28, was driving 99 mph when he slammed his Chevrolet into a BMW driven by 57-year-old Sharon Parrish, of Manassas, a prosecutor said in a Fairfax County court.

Parrish, who worked for the National Geospatial-Intelligence Agency, was heading home from work around 9 p.m. on February 9 when the crash occurred on a Lorton area road. Portillo’s car struck Parrish’s as she was attempting to make a left turn from Ox Road to Henderson Road. She had a green light at the time, the prosecutor said.

The force of the impact flipped Portillo’s car end-over-end and it burst into flames, but he only suffered minor injuries, the prosecutor said. Parrish was pronounced dead at the scene.

Police ruled out alcohol and cellphone use as causes of the crash. In court Monday, the prosecutor did not say why Portillo was traveling so fast and declined to comment on the case after the hearing.

Portillo could face up to 10 years in prison for the offense. He is scheduled to be sentenced on November 18 in Fairfax County Circuit Court.