ADRIAN, Mich. -- A 17-year-old from Adrian was arrested in connection with the slaying of his parents , said police.

Marshal Sosby was charged with two counts of open murder in connection with the shooting of his father and mother after an alleged argument with his father over a cell phone bill.

Sosby first called 911 Monday night to report his parents died in a murder/suicide.

Police said Sosby and his siblings were found outside the home and investigators said Sosby threatened his siblings if they did not go along with his story.

Sosby is being held without bond at the Lenawee County Jail.