Jarrod W. Ramos has been charged with five counts of first-degree murder in one of the deadliest attacks on journalists in USA history.
A judge threw out Ramos' suit and an appeals court upheld that decision in 2015, saying he didn't "come close to alleging a case of defamation".
"The fellow was there to kill as many people as he could, " Anne Arundel County Police Chief Timothy Altomare said.
The New York Police Department said it was beefing up security at New York-based news organisations as a precaution.
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President Donald Trump on Friday called the shooting a "horrible, disgusting event".
US President Donald Trump, yesterday said: "This attack shocked the conscience of our nation and filled our hearts with grief". Trump, who has repeatedly denounced the press as "the enemy of the American people", says journalists "should be free from the fear of being violently attacked" while doing their jobs. Fischman was editorial page editor. Authorities say the 38-year-old, armed with a shotgun, intentionally targeted the newspaper in a shooting that leftfive dead. "They don't make a lot of money". Journalists crawled under desks and sought other hiding places, describing agonizing minutes of terror as they heard the gunman's footsteps and the repeated blasts of the weapon. "They're all good people just trying to support a local newspaper, and now everyone is wondering how could this have happened". The Episcopal Diocese of Maryland announced that the city's houses of worship had planned a prayer vigil at 7 p.m. Friday at a mall across the street from the shooting site.
Governor Larry Hogan ordered Maryland flags lowered to half-staff in honor of the victims of the shooting. Ramos went on to sue the newspaper and Hartley for defamation, but his case was ultimately tossed.
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Neither Mr Hartley nor Mr Marquardt is still employed by the paper or were at its office on Thursday. In 2011, Ramos pled guilty in a harassment case involving the online stalking of a woman he went to high school with.
Court records show a man charged with killing five people at a Maryland newspaper was sacked from a government IT contractor because of concerns about his "suitability".
In a police report filed that year, detective Michael Praley said he "did not believe that Ramos was a threat to employees" at the paper because he had not tried to enter the building and hadn't sent "direct, threatening correspondence".
"The shooter has not been very forthcoming, so we don't have any information yet on motive", Anne Arundel County Executive Steve Schuh said.
Naseem Miller covered the 2016 Pulse Nightclub shooting as a reporter at the Orlando Sentinel, and the food and gifts from other journalists kept the newsroom going while covering the tragedy, she said.
He added there was evidence to show he meant to "kill as many people as he could". They're putting together packages for The Baltimore Sun, and another group is putting together packages for the Capital Gazette. "I knew he did it...."
After his lawsuit against the newspaper was dismissed, Ramos posted profanity-laced tweets about the paper, its reporters and editors.
"I, for one, received what I considered to be a death threat", said Tom Marquardt, former Capital Gazette editor and publisher. "I felt threatened the whole time".
He also said there was "one victim who attempted to escape through the backdoor and was shot at that point". He has appeared in court, and been held without bail, pending a hearing date.
The newspaper is part of Capital Gazette Communications, which also publishes the Maryland Gazette and CapitalGazette.com.