Isaac Anya Ojiabo Jr. was taken into custody without incident, spokesman Edward Hopkins said.
Detectives found him in his 2007 Lexus SUV at Crouse and Putnam roads near his neighborhood at about 5 a.m.
His mother, 51-year-old Joy Ojiabo, was found dead in the 1600 block of Rushing Stream Court; she had been stabbed in the chest, Hopkins said.
Joy Ojiabo's husband, Anya Ojiabo, found her in a room on the second floor, Hopkins said. Her body was taken to the Office of the Chief Examiner in Baltimore for an autopsy.
Investigators had been searching for Ojiabo overnight following after the stabbing, which was reported shortly before 5:30 p.m.
Issac Ojiabo Jr. has been charged with first- and second-degree murder and assault with a deadly weapon.
A motive has not been identified, but Hopkins said there is a history of domestic problems at the house.
Hopkins said deputies were called to the home three times in the past year for domestic disturbances involving Joy Ojiabo and her son, including visits in March, September, and December.
“Just because we’re there a half-dozen times doesn’t mean we’re going to arrest anyone, nor it is indicative that this young man was going to do this,” Hopkins said. “Family situations are tough, they can be tough to gauge.”
The family’s troubles were known around their small cul-de-sac, according to the Ojiabo’s next-door neighbor.
“I think there had been arguments between the parents and the children,” said the neighbor, Lisa, who declined to give her last name. “Someone in the neighborhood told me there had been arguments.”
The neighbor said her family did not often interact with the Ojiabos, who she said were Nigerian and had lived in the neighborhood for approximately six years. She said she believed that Isaac Ojiabo attended Fallston High School and had worked at a local Subway restaurant, and that his mother was an attorney.
“It’s devastating, totally devastating,” she said.
The killing is Harford's first homicide in 2014.
Ojiabo is being held without bail at the Harford County Detention Center in Bel Air. He did not appear for a bail review hearing in Harford County District Court Thursday.
The relatively new Morning Brook Farm neighborhood where the stabbing occurred is off Morse Road and consists of large single family homes.
According to state tax records, Isaac Ojiabo Sr. and Joy Ojiabo acquired their 6,100-square-foot home from builder Toll Brothers in November 2007, paying $1,032,847 for the house and one-acre lot.