10/22/2015 09:25 EDT | Updated 10/22/2016 01:12 EDT

Investigators believe drywall hammer may have been used in Richard Oland murder

SAINT JOHN, N.B. — The lead investigator of the Richard Oland murder says police suspect a drywall hammer or similar instrument was used to kill the Saint John businessman.

Const. Stephen Davidson says no weapon has ever been found.

Davidson is testifying at the second-degree murder trial of Dennis Oland.

Oland has pleaded not guilty.

Yesterday the court was shown video of the police interview with Oland on July 7, 2011, the day his father's body was found face down in a pool of blood in his Saint John office.

During the interview Oland said he had no involvement in his father's death.

The court has heard that Richard Oland, who was 69, was struck more than 40 times in the head and neck with a hammer-type instrument and a blade-like weapon.

The Canadian Press