STOCKTON, Calif. -- Six unprovoked murders of men ages 21 to 54 Since April 2021 appear to be the work of one person, according to police in Stockton, California.Stockton police told ABC News that all of the victims were ambushed, none were robbed and none of the incidents were drug- or gang-related.Lawrence Lopez "was just a person who was out here at the wrong place at the wrong time at the wrong circumstance," his brother Jerry Lopez told ABC Sacramento affiliate KXTV."(We're) still looking at it from a random point of view, but we do see some similarities," Police Chief Stanley McFadden said Wednesday."We have been provided absolutely zero evidence that leads us to believe that one individual is running rampant in the city of Stockton killing people.""