A man with a prior strike conviction under California's “three strikes” law has pleaded no contest to kidnapping and sexual assault charges.

On Dec. 3, 2015, a woman was working alone at a 76 gas station in Citrus Heights when 38-year-old Steven Porter entered the store, took out a knife and forced her out of the store, threatening to stab her if she didn’t comply, according to a Sacramento County District Attorney’s Office new release. Porter forced the woman to walk at knife point about a half-mile to a trailer where he lived. He then repeatedly sexually assaulted her and forced her to perform sex acts on him, prosecutors said.

After the assault, the woman persuaded Porter to let her leave by agreeing to be his friend and not press charges. She memorized the street address and contacted police. Officers quickly arrived at the location, where they saw Porter outside holding the knife he had used to assault the woman.

Surveillance video, the woman’s identification of Porter in a photo lineup and DNA evidence proved Porter was the assailant, authorities said.

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Porter’s criminal history includes a 2006 prior strike conviction for assault with a deadly weapon and a 2001 conviction for stalking with intent to cause fear.

He is to be sentenced Aug. 5 by Sacramento Superior Court Judge Kevin McCormick and faces approximately 300 years to life in prison, according to the District Attorney’s Office.