KINGSTON, Ont. - Jurors in Kingston, Ont., are expected to hear expert testimony today about how a car ended up submerged in a canal with the bodies of a Montreal woman and three teenage girls inside.

Sisters, Zainab, 19, Sahar, 17, and 13-year-old Geeti Shafia, were discovered with their polygamist father's first wife, Rona Amir Mohammad, 50, in the car in the Rideau Canal in June 2009.

The girls' parents, Mohammad Shafia, 58, and Tooba Mohammad Yahya, 41, and their son Hamed Mohammad Shafia, 20, are charged with first-degree murder in the deaths.

The Crown alleges they staged the crash scene to make it look like an accident after being outraged at the "treachery" of the girls for daring to have boyfriends.

On Tuesday, jurors saw for themselves how the bodies looked suspended in water as police video footage was played.

The Crown's theory of the car's path is that it would have had to travel past a locked gate, over a concrete curb and a rocky outcrop and then make two U-turns to end up in the locks of the canal.