A Toronto jury has found a former pastor guilty of manslaughter in the death of his pregnant wife.

Philip Grandine had been on trial for first-degree murder in the death of his late wife, Karissa, who drowned in a bathtub three years ago.

On Thursday, a jury found him guilty of manslaughter. Philip Grandine showed no expression as the verdict was read.

Paramedics were called to the couple's home in October 17, 2011, for a call regarding a woman in medical distress. She was pronounced dead in hospital.

Her husband was arrested more than six months after she died.

During the trial, prosecutors had alleged that Philip Grandine, who was 25 at the time, drugged and drowned Karissa Grandine so he could continue a relationship with another woman — one of his parishioners.

Karissa Grandine was 29 when she died, and five months pregnant.

Defence raised possibility of accidental death

During the trial's closing arguments this week, Philip Grandine's lawyer suggested his wife might have killed herself or died accidentally.

Philip Grandine told police he went out for a run, came back to find his wife in the tub. The Crown argued that in his role as a nurse at a seniors' home, he had access to sedatives, including Lorazepam.

The court heard that Grandine's wife found out he was having an affair with a woman from his Baptist church. Even though he agreed to end the relationship, he didn't end up doing that.

According to his lover, who testified in court, he continued to sleep with her after Karissa Grandine's death for several months.

The Crown contended Grandine's 911 call indicated he did not drain the tub or attempt CPR, even though he's a nurse.

Grandine has not been in custody during the trial. On Thursday, he was led away in handcuffs.

He never testified in his own defence as is his right.

His lawyer suggested Karissa Grandine committed suicide — devastated by her husband's affair, which she found out about two months prior — or she slipped in the bathtub and drowned.

What the jury didn't hear was Justice Robert Clark admonishing Grandine's lawyer after his closing arguments —

for mixing up names, calling his client "Mr. Lorazepam" and making "significant misstatements of evidence" that the judge called "very troubling indeed."