BUFFALO - Another trial of anti-abortion extremist James Kopp is underway in Buffalo.

Kopp is charged with violating the Freedom of Access to Clinic Entrances act by killing a doctor in 1998.

Kopp is defending himself on the federal charge.

In the first day of the trial, he apologized to the widow of abortion provider Dr. Barnett Slepian.

Kopp also declined to cross-examine Lynne Slepian after she described how her husband fell against her after he was shot in the kitchen in their Amherst home.

Kopp is already serving 25 years to life on a state conviction of second-degree murder.

A federal conviction would carry a maximum sentence of life without parole.

Kopp was also a suspect in four non-fatal shootings of doctors in the Hamilton, Winnipeg and Vancouver areas and in Rochester, New York.