A California 7-Eleven employee was left brain-dead after her manager sat on top of her during a “senseless” on-the-job attack — and died Wednesday after she was taken off life support.

Jessica McLaughlin, 24, was working at a Los Angeles 7-Eleven on June 24 when her unidentified female manager — who remains at large — “violently and senselessly attacked” her after the pair got into an argument shortly after 2 p.m., the Los Angeles Times reported.

During the attack, the deranged Big Gulp slinger pulled McLaughlin’s hair and sat down on her employee’s upper body with her full weight, preventing her from breathing.

“She held her down, sat on top of her, and didn’t let her breathe,” the victim’s brother Sean McLaughlin wrote in a GoFundMe.

Concerned co-workers tried to pry the madwoman off McLaughlin but became targets themselves, Fox11 reported.

While they attempted to revive McLaughlin, the manager supposedly ran into the 7-Eleven’s back office and tried to erase security footage, according to the GoFundMe.

McLaughlin collapsed while struggling free and never regained consciousness.

She was taken to Hollywood Presbyterian Hospital in serious condition, and doctors declared her brain-dead due to a lack of oxygen, the LA Times reported.

Her family decided to take her off life support days after the attack, and she died Wednesday, according to Fox 11.

“Jessica had a way of making people feel safe, accepted, and loved. You could come to her with anything and know you wouldn’t be judged,” her brother wrote on GoFundMe.

“She had such a beautiful soul and deserved so much better than the way her life was taken from her.”

Cops are still seeking her suspected attacker, and the investigation is ongoing.

“Our hearts are with those impacted during this difficult time. The suspect has been terminated, and we continue to fully cooperate with law enforcement in their investigation,” 7-Eleven said in a statement.