Arsenio Collins and four others plotted to rob a Laguna Niguel medical marijuana dispensary in September 2009.
The owner of the dispensary saw the group approach his store and felt something was awry. He let Collins into the store, but locked the door before the others could enter.
Once inside the store, Collins pulled out a firearm, pointed it at the owner and two employees and announced, "This is a robbery."
At that point, the owner struggled with Collins, who fired his gun twice trying to shoot the owner. The shots went through a window and no one was hit. Collins tried to shoot the owner several more times, but his weapon would not discharge.
The owner and the employees were able to pry the weapon away from Collins, and he was arrested at the scene by responding officers.
Collins was convicted by a jury Oct. 4, 2010 of two felony counts of attempted murder with premeditation and deliberation, two felony counts of attempted robbery and two felony counts of assault with a firearm.
Three of the four co-defendants were also arrested, but the fourth was not identified.
Anyone with information regarding the fourth defendant is urged to contact the district attorney at (714) 834-5649.