By John Young
Updated June 10, 2010 at 09:21 PM EDT

Olympic gymnast Shawn Johnson testified Thursday in Los Angeles Superior Court in a case involving a man accused of stalking the Dancing With the Stars winner, according to the Associated Press. A 36-year-old man was accused of breaking into a studio lot to meet Johnson as she competed on the ABC show; he was later charged with felony stalking and burglary, and plead not guilty by reason of insanity. Authorities allegedly found a knife, handgun, shotgun, and bulletproof vest in the defendant’s car when he was arrested in March. Authorities said that they had also found love poems the man had written for Johnson.

“I didn’t know him,” Johnson, 18, said while testifying in court. “He was a stranger to me. To see somebody have that much obsession, it made me really scared.” The defendant, who allegedly traveled from Florida to L.A. with the hope of meeting and marrying Johnson, could face up to four years in prison if convicted.