UPPER MERION TWP., Pa. -

Closing arguments are expected Wednesday in the case of a Montgomery County man accused of killing his family.

Joseph McAndrew Jr. is on trial for the March 2011 deaths of his mother, Susan McAndrew, 64; father, Joseph McAndrew, 70; and twin brother, James McAndrew, at their home in Upper Merion Township.

Police said McAndrew, 27, used an 18-inch dagger in the homicides.

Prosecutors have said they are seeking the death penalty