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Guantanamo Bay Naval Base, Cuba • Jurors considering a sentence for a former teenage al-Qaida militant got a stark message Thursday from a government-hired psychiatric expert: The last Westerner at Guantanamo is radical, angry and dangerous.

Omar Khadr was an extremist when he was taken to Guantanamo, where he was "marinated in radical jihadism" over eight years in custody and became a leader among prisoners, said Michael Welner, a forensic psychiatrist who analyzed the 24-year-old Canadian on behalf of military prosecutors.

"He's highly dangerous," Welner told jurors. "He is full of rage."

Khadr, who was 15 when captured by the U.S. after a fierce firefight in Afghanistan in 2002, pleaded guilty Monday to five war crimes charges as part of a plea deal that spared him from a possible life sentence and calls for sending him back to his homeland after one more year in Guantanamo.

The jury cannot impose a sentence greater than the amount set by the agreement, reportedly eight years, but it can issue one that is more lenient.

Welner, who has testified as an expert witness in many high-profile cases in recent years, said he spent more than seven hours interviewing Khadr over the summer, reviewed his records from the U.S. detention center in Cuba and studied interviews with family members in Canada who have embraced extremist positions.

His conclusion: Khadr has shown no interest in changing his radical views on Islam and has no real remorse for throwing a grenade that killed an American soldier and partially blinded another during a four-hour firefight in Afghanistan in 2002.

The only thing the prisoner seems to regret, Welner said, is his imprisonment and he seems unlikely to change. "He is very angry about being in custody," he told the jury of seven military officers.

The psychiatrist praised Khadr's intelligence, noting he had mastered several languages and can be "quite charming."

But he faulted the prisoner for not doing more to improve his limited education while at Guantanamo by reading more than "Harry Potter" books.