The grandson of a New Smyrna Beach woman found dead inside her own home has now been charged with her murder.

Patrick Campbell was taken into custody after he turned himself in Thursday to FBI agents.

New Smyrna Beach police said Campbell drove his grandmother's car to the Raymond James building in Daytona Beach, turned himself in and later came face-to-face with investigators who had been searching for both him and the car for nearly 24 hours.

Campbell was initially charged with grand theft auto, but police and federal agents now say Campbell confessed to the murder of his grandmother, Darlene Robertson.

Investigators said Robertson, 64, was beaten and stabbed to death. Her son found her body Wednesday morning and called 911.

911 dispatcher: How long has she been down for? Can you look at her?

Robertson's son: I have no idea. She didn't show up for work this morning. Somehow they got in touch with my wife. She called me; I happen to be fairly close by, came by to check on her, and — dead — she's right in the middle of my living room.

Police processed Robertson's Nissan Altima for evidence after Campbell, 27, drove it to meet with his former lawyer, Catherine Drees, who represented him for past traffic violations.

"He came just to see if I would introduce him to one of the federal agents in the building, as he wished to talk to them," Drees said.

Drees, along with family members, said they believe Campbell is a paranoid schizophrenic. His last known address was in Edgewater, but was recently seen by neighbors visiting or staying with Robertson.

Soon after Campbell met with federal agents, New Smyrna Beach police arrived and took him into custody. Campbell did not answer any questions as police led him handcuffed to a squad car.

"I just think that this is the type of person that would prefer a federal agency involved, perhaps because he has seen state agencies, when they arrest people, throw them to the ground," Drees said.

Campbell was quietly led away, refusing to answer any questions. He will go before a judge Friday.