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A man rushed to save his 17-year-old niece from sexual assault. He was shot and killed.

The teen's uncle heard screams coming from her bedroom. He rushed to confront the attacker, who had sneaked in through the window, police said.

A Chicago man was shot to death Thursday night after he rushed to save his teenage niece from an assailant in her home, authorities said.

The killer sneaked through a window of the 17-year-old's bedroom at about 9 p.m., and she screamed for help as he sexually assaulted her, according to a police statement.

The girl's 66-year-old uncle ran to help her but was shot in the head and back by the attacker, authorities said. He was rushed to University of Chicago Medical Center, where he died.

A suspect was taken into custody a short time later, but he had not been charged as of Friday morning, a police spokesman said.