The actor who appeared in the film The 40-Year-Old Virgin has been convicted of attempted premeditated murder in the knife attack of his ex-girlfriend.

Jurors in San Diego on Thursday also found Shelley Malil guilty of assault with a deadly weapon.

He was acquitted of residential burglary.

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The panel began deliberations on Wednesday in Vista Superior Court after a three-week trial.

Indian-born Malil played Haziz, a co-worker of Steve Carell's character in The 40-Year-Old Virgin.

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He faces up to 21 years to life in prison.

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The 40-Year-Old Virgin star, Shelley Malil has admitted stabbing his former girlfriend more than 20 times, but claims he mistook her for someone else, RadarOnline.com has learned.

The actor took the stand in a Vista, California courtroom on Thursday and apologized for attacking his ex, 38-year-old Kendra Beebe, two years ago with a knife.

"I'm sorry," said Malil - who pled not guilty to premeditated attempted murder, assault with a deadly weapon and residential burglary.  "I had no idea. I saw the pictures of her wounds for the first time, I was stunned.

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"When I look at those pictures I still can't believe the knife I was holding was responsible for all those injuries."

Keebe claims the actor stabbed her at her home after seeing her with another man.

But Malil told the court he did not mean to hurt her and simply felt threatened by the company she was keeping,

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He said he had gone to her home and witnessed her and friend David Maldonado drinking wine together.

Believing Maldonado was going to attack him, he went for the knife.

"I heard the chair behind me backing up," he recalled. "I reach for the knife. I grab half the handle and he's pulling my arm, and I'm pulling away from him."

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After a scuffle, Malil claimed to have lost sight of Maldonado so he headed to the kitchen to find him, only to see Maldonado heading to his car.

"I'm almost positive this guy's got a gun and coming after me," he said. "I come around the corner. It's eerily quiet. All of a sudden, out of nowhere, I get hit from the back on the side of the head. It felt like cold granite countertop."

Malil then remembers lashing out in the darkness for more than a minute before discovering it was Beebe, who was screaming for '911'.

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"That's the first time I look and see its Kendra I'm fighting with."

If convicted of the charges against him, Malil faces 21 years in jail.

Closing statements are expected to be made on Tuesday.