Order, Supreme Court, New York County (Marcy Friedman, J.), entered January 18, 2007, which denied plaintiffs motion
Where a liability insurance policy requires notice of an occurrence to the carrier as soon as practicable, such notice must be given within a reasonable period of time, and the insured’s noncompliance in this respect constitutes failure of a condition precedent (Great Canal Realty Corp. v Seneca Ins. Co., Inc., 5 NY3d 742 [2005]), thus vitiating the contract as a matter of law, without a showing of prejudice (Argo Corp. v Greater N.Y. Mut. Ins. Co., 4 NY3d 332, 339 [2005]).
Plaintiff became aware of its employee’s accident and his ensuing lawsuit almost immediately, but did not notify defendant excess insurer for some 5 1/2 years, until after the defendants in the underlying matter had instituted a third-party action against it. “[W]here a reasonable person could envision liability, that person has a duty to make some inquiry” (White v City of New York, 81 NY2d 955, 958 [1993]). Although a good-faith belief in nonliability may excuse the failure to give timely notice (see Great Canal Realty Corp. v Seneca Ins. Co., Inc., 5 NY3d 742 [2005]), there is no indication plaintiff ever took any action to ascertain the possibility of its own liability for the accident prior to the commencement of the third-party action. Accordingly, there is no basis for a good-faith belief in its nonliability. Moreover, plaintiffs own duty to provide notice to the excess insurer is not negated by the insurer’s actual knowledge acquired from another source (Ocean Partners, LLC v North Riv. Ins. Co., 25 AD3d 514, 515 [2006]; Travelers Ins. Co. v Volmar Constr. Co., 300 AD2d 40 [2002]). Notice under a workers’ compensation policy does not constitute notice under a liability insurance policy (see Nationwide Ins. Co. v Empire Ins. Group, 294 AD2d 546, 548 [2002]). Plaintiffs protracted delay in giving defendant insurer the requisite contractual notice relieved the insurer of its obligation to defend or indemnify plaintiff. Concur—Marlow, J.P., Williams, Gonzalez and McGuire, JJ.