Longtime Denver journalist Marilyn Robinson, who broke into a male-dominated news industry and set a standard for tenacious and accurate police reporting over 45 years, died on Saturday at the age of 89. Former colleagues remembered her as a 5-foot-3, Keds tennis shoe-clad woman with enormous grit. Through multiple casts of owners and editors at The Denver Post, Robinson carefully gathered information on law enforcement and crime, then produced thousands of reports conveying the hard side of a rapidly expanding city. Robinson relied on relentless questioning, modeling the methods and core values of journalism to inform the public — even when the news was horrific and unwelcome, such as the murder of JonBenet Ramsey and the Columbine High School tragedy, for which The Post won a Pulitzer Prize. She worked mostly in the newsroom beneath towering stacks of old newspapers and her notes, making countless calls to dispatchers, desk sergeants and frontline officers from the old landline telephones, sometimes with a phone on each ear, sustaining herself on coffee, Pepsi, popcorn and yogurt.