One of two men accused of killing a family of five over drugs and setting their house on fire was found guilty Tuesday.

Prosecutors accused Mark Serrano, 30, and Charles Gilleo Jr., 32, of killing Tina and Manuel "Tony" Morey and their three young sons in the early hours of Jan. 19, setting the family's house on fire and stealing cocaine from Tony Morey. Prosecutors said Serrano and Gilleo had previously bought drugs from Manuel Morey.

A Dutchess County jury deliberated for five hours before returning its guilty verdict against Serrano on all charges except first degree arson. Serrano was found guilty of 20 counts of first-degree murder, 11 counts of second-degree murder, six counts of robbery, one count of third-degree arson, two counts of conspiracy and one count of perjury.

Gilleo has pleaded not guilty to the same 42 charges Serrano faced and is set to be tried early next year.

According to an autopsy, Manuel Morey died of a gunshot wound to the neck. Tina Morey, 30, died of gunshot wounds to the chest and head. Manuel "Tony Jr." Morey, 13, and Adam, 10, died of multiple stab wounds. Ryan, 6, died from blunt-force trauma to the head.