California Code, Labor Code - LAB § 3601

(a) Where the conditions of compensationset forth in Section 3600 concur, the right to recover such compensation, pursuant to the provisions of this division is, except as specifically provided inthis section, the exclusive remedy for injury or death of an employee against any other employee of the employer acting within the scope of his or her employment, except that an employee, or his or her dependents in the event of his or her death, shall, in addition to the right to compensation against the employer, have a right to bring an action at law for damages againstthe other employee, as if this division did not apply, in either of the following cases:

(b) In no event, either by legal action or by agreement whether entered into by the other employee or on his or her behalf, shall the employer be held liable, directly or indirectly, for damages awarded against, or for a liability incurred by the other employee under paragraph (1) or (2) of subdivision (a).

(c) No employee shall be held liable, directly or indirectly, to his or her employer, for injury or death of a coemployee except where the injured employee or his or her dependents obtain a recovery under subdivision (a).