BOSTON — A GoFundMe campaign for the family of Boston Police Officer Nicholas O'Malley — the 33-year-old cop charged with manslaughter for fatally shooting a carjacking suspect in Roxbury last week — has raised nearly $200,000, with donations pouring in from more than 1,200 supporters.

"With two young children depending on them, the financial road ahead is uncertain," the fundraiser reads. "Any contribution, no matter the size, will go directly toward helping them cover essential expenses and regain their footing during this challenging period."

O'Malley, a Randolph native and Westfield State University graduate, is married with a three-year-old daughter and a six-month-old baby. He was arrested at his home on Thursday morning — not given the opportunity to turn himself in voluntarily — and arraigned in Roxbury Municipal Court on a voluntary manslaughter charge in connection with the March 11 shooting death of Stephenson King, 39, of Dorchester.

King, who had 47 prior charges including strangulations and gun offenses, was out on bail for four pending felony cases and wanted on a warrant at the time of the incident. He had allegedly carjacked a woman — assaulting her and ordering her out of her running vehicle — before officers located him in the stolen car.

The rapid pace of donations reflects the depth of public support for O'Malley, which was already on display at his arraignment when roughly 60 uniformed Boston police officers packed the courthouse sidewalk in a show of solidarity.

Larry Calderone, president of the Boston Police Patrolmen's Association, said at the time that the charge represented "Monday morning quarterbacking" of a split-second decision made under extreme stress. O'Malley's attorney, Kenneth Anderson, called the prosecution "election-year tactics" by Suffolk County District Attorney Kevin Hayden, who is up for reelection.