US actress Anne Hathaway has urged people to ask "how decent are we really?" following the fatal stabbing of a black teenager in California.
The Oscar-winning actress wrote a post on Instagram dedicated to Nia Wilson, 18, who was killed after she was stabbed in the neck at a train station in Oakland last Sunday.
Police said the 27-year-old suspect, John Lee Cowell, was in custody.
It's unclear whether race played a part in the attack but in a lengthy post in the aftermath, Hathaway called out white privilege.
Some have claimed the attack was racially motivated because Cowell is white, though there is no evidence to support this claim according to police.
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"She [Ms Wilson] is not a hashtag; she was a black woman and she was murdered in cold blood by a white man," the Ocean's 8 actor wrote.
"White people - including me, including you - must take into the marrow of our privileged bones the truth that ALL black people fear for their lives DAILY in America and have done so for GENERATIONS."
She went on: "Given those givens, we must ask our (white)selves- how “decent” are we really? Not in our intent, but in our actions? In our lack of action?"
Hathaway closed comments on the post.
Ms Wilson was heading home from a family event when she was attacked. Her sister Lahtifa Wilson was also stabbed in the attack but survived.
Police chief Carlos Rojas said at a news conference on Monday that it was "the most vicious" attack he had seen in his nearly 30-year career.
The random murder has prompted nearly 1000 people to march in Oakland for a vigil.
Ms Wilson's family and others in the community have told US media the murder should be considered a hate crime.
