SAN FRANCISCO – The former police officer convicted of killing an unarmed black man in an Oakland train station wrote a letter apologizing to the victim’s family, saying he’ll forever “live, breathe, sleep and not sleep” with memories of the “terrible event,” according to a copy released by his lawyer Friday.

Johannes Mehserle said in the handwritten letter that he “never intended” to shoot 22-year-old Oscar Grant, who died of a gunshot wound to the back after being pulled off a Bay Area Rapid Transit train on New Year’s Day 2009.

The emotional letter is dated July 4, four days before a Los Angeles jury convicted him of involuntary manslaughter. The trial was moved following rioting in Oakland after Grant was killed.

“For now, and forever I will live, breathe, sleep, and not sleep with the memory of Mr. Grant screaming ‘You shot me’ and putting my hands on the bullet wound thinking the pressure would help while I kept telling him ‘You’ll be okay!’” Mehserle said in the letter.

Thursday’s verdict outraged Grant’s family and touched off violent protests in Oakland.

Mehserle, 28, testified during his trial that he struggled with Grant and saw him digging in his pocket as officers responded to reports of a fight.

Fearing Grant may have a weapon, Mehserle said he decided to shock Grant with his Taser but pulled his .40-caliber handgun instead. Grant was shot as he lay face-down.

The jury found that Mehserle didn’t mean to kill Grant, but that his behavior was still so negligent that it was criminal.

The judge has a tremendous amount of discretion in handing down punishment Aug. 6 against Mehserle, anywhere from probation to 14 years.