SANTA ANA – An Orange County Superior Court jury on Monday determined that a 24-year-old Anaheim man was sane when he fatally stabbed a janitor more then 20 times and stomped on the man’s head before mopping up the crime scene and calling 911.

The jury, on Oct. 3, had convicted Robert Gabriel Rodgers of first-degree murder for the Nov. 14, 2014 killing Caesar Ramirez-Raphael, 24, in the Volcano Tea House, which has since closed. Rodgers had pleaded not guilty by reason of insanity.

He faces a sentence of life in prison without possibility of parole when he returns to court on Nov. 17.

Prosecutors said Rodgers went to the tea house at about 9:30 a.m.and attempted to lure Ramirez-Raphael, who was inside cleaning. The two did not know each other, attorneys said. After several minutes, Ramirez-Raphael unlocked the door and Rodgers barged in with a knife in each hand.

Jurors were shown the violent confrontation in a surveillance video, where Rodgers could be seen repeatedly stabbing Ramirez-Raphael and then dragging him into a back room. Rodgers then picked up a bucket and mop to clean the crime scene, and at one point can be seen brushing his teeth.

A female employee showed up for her shift and saw a man she did not recognize inside. The woman, sensing something was wrong, locked the door from the outside as a bystander called 911.

While locked inside the shop, Rodgers called 911 from his cell phone and asked for police to respond but didn’t elaborate.

Police found Ramirez-Raphael’s body stuffed head first into a trash can.

Rodgers’ defense attorney had argued that he suffers from mental issues and was not sane at the time of the crime.

Attorneys said Rodgers had visited the tea house the day before the killing to see a former high school classmate who worked there. Rodgers had asked the woman if he could use the bathroom and tried to give her a hug, but the woman shied away and he left, prosecutors said.

The woman was scheduled to work at the shop the morning of the killing.