Hate crime charges in Facebook Live attack

Priscilla Covington, grandmother of sisters Brittany Covington, 18, and Tanishia Covington, 24, is seen outside bond court at the Leighton Criminal Court Building on Jan. 6, 2017.

This empty apartment in the 3300 block of West Lexington Street is where police say four people held and beat an 18-year-old man with mental disabilities on Jan. 4, 2017.

Chicago police Superintendent Eddie Johnson speaks Jan. 5, 2017, at police headquarters about the attack on an 18-year-old man with mental disabilities that was shown in a Facebook Live video and the resulting charges filed against four people suspected of the attack.

This apartment building in the 3300 block of West Lexington Street is where authorities say four people held and beat an 18-year-old man with mental disabilities before he managed to escape into the cold.

Chicago police Officer Michael Donnelly speaks with the news media Jan. 5, 2017, about how he found the 18-year-old man wandering the streets in shorts in the Homan Square neighborhood.

Items left behind sit on a window sill Jan. 5, 2017, in an empty apartment in the 3300 block of West Lexington Street where police say four people held and beat an 18-year-old man with mental disabilities.

Neighbors and news media members walk through an apartment Jan. 5, 2017, in the 3300 block of West Lexington Street, where police say four people held and beat an 18-year-old man with mental disabilities.