PHOENIX -- A possible plea deal in the deadly Tucson shootings that wounded then-Rep. Gabrielle Giffords would send Jared Lee Loughner to prison for the rest of his life, a person familiar with the case said Saturday.

A court-appointed psychiatrist will testify Tuesday that Loughner is competent to enter a plea in the shooting rampage that killed six people and injured 13, including Giffords, said the person, who was not authorized to discuss the case publicly and spoke on condition of anonymity.

A status conference in the federal case had already been scheduled for Tuesday in Tucson, Ariz.

The person, speaking about upcoming events in the case, said the plan is for Loughner to enter a guilty plea in the murders and attempted murders. The plan is contingent on the judge in the case allowing Loughner to enter the plea.

Bill Solomon, a spokesman for the U.S. attorney's office, said Saturday he could not comment on Loughner's case and the possibility of a guilty plea.

The Pima County attorney's office, which has said it could also pursue state prosecution of Loughner, declined to comment, said spokeswoman Isabel Burruel Smutzer.

Loughner has pleaded not guilty to 49 federal charges stemming from the Jan. 8, 2011, shooting outside a Tucson supermarket where Giffords was holding a meet-and-greet with constituents.

Authorities said he shot Giffords, opened fire on the crowd and was subdued by bystanders. Giffords was shot in the head and subsequently left Congress to devote her time to rehabilitation.

Giffords and her husband were traveling in Europe, and spokeswoman Hayley Zachary said Saturday she had no information on developments in Loughner's case.

Experts have concluded that Loughner suffers from schizophrenia, and prison officials in Missouri, where Loughner has been held, have forcibly medicated him with psychotropic drugs.

Even though psychologists have said Loughner's condition is improving, his lawyers have vigorously fought the government's efforts to medicate him.

At one point, a federal appeals court halted the forced medication, but resumed it once mental health experts at the prison concluded that Loughner's condition was deteriorating further.

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