SAINT JOHN, N.B. -- An RCMP blood spatter expert says he was called four days after Richard Oland's murder to assist in the investigation.

Sgt. Brian Wentzell of Halifax testified today that he arrived in Saint John, N.B., on July 11 and began to examine the scene.

Dennis Oland has pleaded not guilty to second-degree murder in the Court of Queen's Bench in the death of his father, whose body was found in a pool of blood in his office on July 7, 2011.

Wentzell said by the time he arrived, blood had dried and was beginning to flake away from the floor.

He told the jury that it was also a disadvantage to his work that the body had already been removed.

Court has heard that 69-year-old Richard Oland was struck more than 40 times in the head with a hammer-type instrument and a blade-like weapon.

No murder weapon was ever found.