The young girl died at the hospital after finding her mother's gun stored in a closet and shooting herself, according to deputies.
Police said the 17-year-old was playing with the gun, showing it off to a friend, when it went off, and he was shot. HPD said officers are speaking with the friend as well.
"Boys learned a lesson tonight," HPD Lt. Ronnie Willkens said after a 14- and 18-year-old were injured during an accidental shooting at an apartment in Houston's Greater Third Ward.
The family was getting ready to get pizza when the boy found the gun under the driver's seat, police said.
Andrew Lester, 86, was set to go on trial this week for shooting Ralph Yarl, a Black teenager who mistakenly knocked on his door.
Former "Even Stevens" actress Christy Carlson Romano is recovering after she says she was shot in the face.