A former pastor whose pregnant wife was found dead in a bathtub at their Scarborough home is facing trial for the second time.

Philip Grandine, 32, has pleaded not guilty to manslaughter. He is accused of either drugging his wife Karissa with the sedative lorazepam causing her to drown in the bathtub, or failing to prevent his sedated wife from getting into the tub when he had a legal duty to do so.

When she died on Oct. 17, 2011, Karissa Grandine, 29, was 20-weeks pregnant and days away from a doctor’s appointment that would tell her the sex of her baby, Crown prosecutor Donna Kellway said in court Friday in her overview of the evidence the jury is expected to hear at the trial.

“She never made it to that Friday,” Kellway said.

Philip Grandine claimed he got home from a run and discovered his wife under the water and not breathing, Kellway said. He called 911 and emergency services arrived shortly after, but his wife could not be revived, she said.

Kellway said Grandine told police he could not recall where he had run for the hour he said he was out of the house.

Cellphone records also showed he was communicating via phone and text message with his mistress until minutes before the 911 call, she said. Grandine’s mistress was a parishioner at the church where he had been a pastor until the affair was discovered and he had to step down.

As a result of the affair, and Grandine’s pornography-watching, Kellway said, a filter preventing access to certain websites had been installed on the couple’s home computer. That filter was uninstalled 43 minutes before Grandine called 911, Kellway said.

Also found on the computer was evidence of searches for questions including: “would you die from 100mg of lorazepam.” Other items were found in the computer’s memory, including the word combinations “benzodiaz and autopsy” and “lorazepam and toxicity.”

Lorazepam, also known by the brand name Ativan, is a type of drug known as a benzodiazepine, a class psychoactive drugs sometimes called “benzos.”

There were also searches for female escorts found on the computer, Kellway said.

Grandine worked as a nurse-manager at a seniors’ home where, Kellway said, he would have had easy access to lorazepam through duties that included disposing of excess medication.

Kellway also told the jury they will hear about an unusual episode a few days prior to Karissa Grandine’s death, when the couple’s marriage counsellor observed her husband acting oddly, including slurring his words and falling asleep.

Karissa Grandine went to the hospital the next day complaining she felt ill. Blood tests show she had lorazepam in her system, though not as much as was found after her death, Kellway said.

The jury also heard a transcript of testimony from Karissa Grandine’s family doctor, who said he had not prescribed lorazepam to either person. The doctor also said Philip Grandine had told him he was not sure if his wife would have been his “first choice” if he could do his marriage again.

The jury also heard the audio of the 911 call. Prior to the call, Grandine had not drained the tub or taken his wife out of it, Kellway said. On the 911 call, he can be heard saying he could not get his wife out of the tub because she was too slippery.

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Kellway told the jury there was a blunt-force injury to Karissa Grandine’s head that could have been caused by a blow or a fall. While the injury could not have caused her death, it could have caused unconsciousness, she said.

The trial continues Monday.