Dakota Culkin, 29, died shortly after she was hit by a car in Los Angeles last week. Police say the collision was an accident and no crimes were committed.
Dakota was one of seven Culkin siblings.
"They're heartbroken. That I can tell you. They're just absolutely heartbroken," the actors' manager Emily Gerson Saines told People magazine.
Saines added that the brothers were all working on various projects when they heard the sad news and have since taken time off to grieve.