Two men from central Maine have been charged by California authorities with murder, following a nine-month investigation into the shooting deaths of a former Augusta couple there.

Robby Beasley, 30, and Elijah McKah, 28, have been held in Lake County, Calif., for several months as police investigated the murders of Frank and Yvette Maddox. The Maddoxes were found dead at the bottom of an embankment in Lower Lake, Calif., in early March.

Beasley and Maddoxes were connected through a marijuana growing operation in Lake County, according to police, and all lived in the area. Beasley has been in custody since shortly after the bodies were discovered.

McKay, also a resident of the area, was arrested in Atlanta, Ga., in October after fleeing California once he was identified as a person of interest in the case, according to Capt. James Bauman of the Lake County Sheriff’s Office.

Both Beasley and McKay are natives of Kennebec County. Beasley was arraigned today, Bauman said. McKay is expected to be arraigned on Thursday.

Additional arrests are expected, Bauman said.