Colley, 83, was found lifeless on the floor of a laundry room inside her $25 million hilltop estate by a caretaker on November 9, 2015, police said at the time.
The suspect, identified as Esdras Anibal Marroquin Gomez - an undocumented Guatemalan native who was a former employee at Colley's sprawling estate - was charged in an indictment unsealed Monday morning at Westchester County Court, sources said.
The DA said Gomez was a day laborer and had worked on the Colleys' property, but was not employed with the family at the time of the killing. There were no signs that anyone had forced their way into the home, according to the station.
"The murder scene was horrendous", Westchester County District Attorney Anthony Scarpino, Jr. said.
Colley's husband, Eugene, is known for his empire of roughly 100 McDonald's restaurants.
Mexican authorities were in the process of deporting him back to Guatemala when his flight stopped in Miami last Tuesday and Gomez was taken into custody by USA officials.
Last week, Gomez was arrested in Cancun and deported back to back to Guatemala. "From our evaluation, we believe the murder weapon was a home fire extinguisher, she was brutally assaulted with that".
The caretaker and Colley's husband were both ruled out at as suspects shortly after she was found dead.
Investigators were tight-lipped about what led them to Gomez but said it took a village of officials from Guatemala to Mexico to bring him in. He said it's possible Gomez went to the home to speak with someone else when he confronted Colley.