(CNN) A Texas grand jury has indicted a former Fort Worth police officer who two months ago fired through the window of a home, killing Atatiana Jefferson.

Early on October 12, Jefferson, 28, was playing video games with her nephew when Officer Aaron Dean and another officer arrived at her home.

A concerned neighbor had called the non-emergency police number after noticing the home's exterior doors were open at that late hour. As officers walked around the house in the dark, Jefferson heard a noise in the back yard, pulled out a gun from her purse and pointed it at the window, police said.

Dean yelled "Put your hands up! Show me your hands!" before he fired through the window, killing her, body camera footage showed. Neither of the officers identified themselves as police.

Attorney S. Lee Merritt, who represents the Jefferson family, tweeted: "Atatiana's family is (relieved) but remain cautious that a conviction and appropriate sentence is still a long way away. Keep pushing."

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