HOUSTON—U.S. Rep. Sheila Jackson Lee called Sunday for a congressional inquiry into what she believes is a state of crisis within the Harris County legal system.

The Houston Democrat primarily cited a recent grand jury decision not to indict suburban homeowner Joe Horn, the retired grandfather who shot to death two men he suspected of burglarizing a neighbor’s home.

“As far as many are concerned, justice was not rendered,” said Jackson Lee, speaking at news conference. “There needs to be a question about how the case was presented. Was there no basis for this individual to be tried by a jury of his peers?”

Jackson Lee said she just returned from a trip overseas, where the case had cast the Houston area in a negative light. She also noted that a 911 operator repeatedly told Horn to stay inside, and that he shot the two men as they seemed to be in retreat.

On a tape of the 911 call, Horn can be heard telling the dispatcher that he was “gonna kill ’em.” Autopsy reports show that the two men were shot in the back, arms and shoulders.

Horn’s attorney has said his client shot the two out of fear for his life when they came into his yard and threatened him.

Jackson Lee said her call for a federal inquiry was also spurred by a string of other controversial cases and scandals involving Harris County criminal justice agencies.

“With the many misgivings surrounding the Harris County legal system, it is fair to say that this local judicial system has been tarnished,” Jackson Lee said. “It is time for all officials to be held accountable and true justice and democracy to be restored.”

Jackson Lee also cited a recent controversy involving the Harris County Sheriff’s Office, where top commanders were disciplined for sending racially insensitive e-mails, including some that mocked the Islamic religion.

Other issues have included the Harris County Jail, which is the subject of a federal civil rights probe, and the resignation earlier this year of former District Attorney Chuck Rosenthal, who left office after sending explicit e-mails on his county computer.

Jackson Lee also pointed to ongoing problems with the Houston Police Department crime lab, which forced suspension of DNA testing twice since 2002. Since then, three men convicted with faulty evidence have been exonerated.

The pattern of behavior raises questions about bias in the system, Jackson Lee said.