SAINT JOHN, N.B. -- Dennis Oland told police the day his father's body was found that he had no reason to kill his father, but police named him a suspect in the murder by the evening of the same day.

The jury in the younger Oland's murder trial was shown video on Wednesday of an interview conducted by an investigator with the Saint John Police Force on July 7, 2011, the day Richard Oland's body was found lying face down in a pool of blood in his Canterbury Street office.

Dennis Oland, 47, has pleaded not guilty to a charge of second-degree murder.

In the video, Oland said his father would often argue with him and say hurtful things.

But when Const. Stephen Davidson of the Saint John Police Force asked whether he had any involvement in his father's death, Oland replied, "No."

"I have no reason to want my father dead."

"We've had our things, but no," he said.

Oland said his father had "pissed off a lot of people," but he couldn't think of anyone who would want him dead.

After jurors viewed the two-and-a-half hour long interview, Crown attorney P.J. Veniot read an agreed statement of facts into the record Wednesday, stating that by 8:22 p.m. on the day of the police interview Oland was formally named a suspect in the murder.

After being informed that he was a suspect, Oland was told that search warrants would be issued for his home.

Davidson took the stand Wednesday, but Veniot didn't ask what prompted investigators to identify Oland as a suspect.

Asked during the videotaped interview to describe his movements the day before Richard Oland's body was found, Dennis said he first arrived at his father's office around 5:15 p.m. on July 6, 2011, but realized he had forgotten some genealogy documents at his own office.

He left, but realized that he didn't have the pass to get back into his office building and decided he had enough documents for his meeting with his father.

He said he arrived again at his father's office at about 5:30 p.m., where his father's secretary, Maureen Adamson, was finishing up for the day. She left 10 to 15 minutes later.

Oland said he left about an hour later, making one stop at a local wharf in Renforth to see if his kids were swimming there, and then went home.

Asked if he could suggest who might have killed his father, Oland told Davidson perhaps a vindictive ex-girlfriend or a crack-head looking for money.

Davidson spent a lot of time repeatedly asking Oland about the route he drove when he started to go back to his office. At one point he said, "It's really important that you remember what you did because we're going to verify all this."

Oland later said he believed he may have taken a different route that included going the wrong way on one street.

"I didn't realize my route plan was so significant," Oland said.

"It's very important," Davidson replied.

Oland said "You have me intimidated now, so I'm getting a mental block."

Davidson asked Oland what he had been wearing that day. Oland said tan pants, dress shirt and navy blazer.

Video that has been previously shown to the court shows Oland wearing a brown jacket that day.

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

During his testimony Wednesday afternoon, Davidson said he went back to the crime scene on July 9 to identify electronic items such as computers that would need to be seized.

He could not say if he wore gloves while there, and also couldn't remember if he wore gloves during the search of Dennis Oland's home on July 14.

Davidson said two items missing from Richard Oland's office have never been found -- his iPhone and the murder weapon.

Davidson has begun to detail efforts to trace the iPhone and will continue that testimony when he returns to the stand Thursday.