ST. JOHN'S, N.L. - A case involving Nelson Hart and a dispute over a spilled lunch in a Newfoundland prison is due back in court today.

Hart is charged with making threats and one count of mischief to property following the feud in 2013.

He was imprisoned in St. John's at the time, pending an appeal of a murder conviction in the deaths of his twin daughters.

Const. Matthew Dixon told provincial court at an earlier hearing that the dispute began when Hart said a prison guard shoved his lunch plate through his cell door slot and onto the floor.

A silent prison security camera video entered as evidence shows Hart laying on his bed as an item falls near the door.

Dixon said Hart told police he came out of his cell and when a guard told him his lunch was on the floor, he grabbed a kettle from the common kitchen area and threw it into a wall-mounted TV.