Oklahoma City bombing conspirator Terry L. Nichols will not appeal state murder convictions for his role in the 1995 bombing of the Oklahoma City federal building, his attorney said Thursday.

Nichols' attorneys had been advising him against appealing the 161 convictions because it could mean a new trial and another opportunity for prosecutors to seek the death penalty. Nichols was sentenced to life in prison Aug. 9 because the jury deadlocked on capital punishment.

Attorney Brian Hermanson said Nichols did not want to prolong the pain for victims' families.

"As he said in his sentencing, Terry sincerely hopes that the final conclusion of this case will be the beginning of a long-awaited healing process for all those impacted by the bombing."

Nichols, 49, is serving life in prison without parole on federal charges for the April 19, 1995, bombing, which killed 168 people. He was convicted of involuntary manslaughter and conspiracy for the deaths of eight federal law enforcement officers, but jurors at that trial also deadlocked on the death penalty.

The state charges are for the other 160 victims and one fetus.

Oklahoma County District Attorney C. Wesley Lane II, who had sought the death penalty in the case, urged Nichols to cooperate with investigators still looking at other possible conspirators.

Timothy J. McVeigh was convicted of federal murder charges and executed in 2001 for carrying out the blast.

In 1995, Oklahoma convicted Terry L. Nichols for 161 deaths.