Facebook co-founder and chief executive Mark Zuckerberg, speaking today at the company’s annual developers conference, addressed the uproar over a horrific video of a murder that was posted to the social networking site.

Steve Stephens, the so-called “Facebook killer,” sparked a multi-state manhunt after he brazenly gunned down a Cleveland man at random, recording the encounter on his phone and uploading the video to Facebook.

Facebook drew criticism for not removing the gruesome video until two hours after Stephens posted it.

Zuckerberg acknowledged that the company has to do more to not only filter out violent videos, but also help foster a safer, more informed community.

“We have a lot more to do here. We’re reminded of this this week by the tragedy in Cleveland," Zuckerberg said. "Our hearts go out to the family and friends of Robert Godwin Sr. And we have a lot of work and we will keep doing all we can to prevent tragedies like this from happening.”

Watch Zuckerberg's remarks above, and see Facebook's official statement on the murder.

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