SACRAMENTO, Calif. — A man nicknamed the NorCal Rapist has been convicted of raping nine women in their homes between 1991 and 2006. A jury in Sacramento found 60-year-old Roy Charles Waller guilty on all 46 counts.

The Sacramento Bee reports that Waller showed no emotion and looked down at the defendant’s table when the jury's decision was read Wednesday. Prosecutors are crediting DNA evidence with helping ensure Waller’s conviction.

During the trial, Waller's attorney questioned whether DNA found at the crime scenes had been preserved properly over the years. Waller faces life in prison when he's sentenced Dec. 18.