BALTIMORE -- A man charged with gunning down five people at a Maryland newspaper sent three letters on the day of the attack, police said, including one saying he was on his way to the Capital Gazette newsroom with the aim "of killing every person present."

Sgt. Jacklyn Davis, a spokeswoman for Anne Arundel County police, said the letters were received Monday. They were mailed to an attorney for The Capital newspaper, a retired judge of the Maryland Court of Special Appeals and a Baltimore judge.

The letter Jarrod Ramos sent to the Annapolis newspaper's Baltimore-based lawyer was written to resemble a legal motion for reconsideration of his unsuccessful 2012 defamation lawsuit against the paper, a columnist and then-publisher Tom Marquardt.

Marquardt shared a copy of the letter with The Associated Press.

"If this is how the Maryland Judiciary operates, the law now means nothing," Ramos wrote. He quoted a description of the purpose of a defamation suit, saying it was intended for a defamed person to "resort to the courts for relief instead of wreaking his own vengeance."

"'That' is how your judiciary operates, you were too cowardly to confront those lies, and this is your receipt," Ramos wrote.

He signed it under the chilling statement: "I told you so." Below that, he wrote he was going to the newspaper's office "with the objective of killing every person present."

In a letter attached to what appeared to be the faux court filing, he also directly addressed retired special appeals court Judge Charles Moylan, who ruled against Ramos in his defamation case. Ramos sued the paper after pleading guilty to harassing a high school classmate.

"Welcome, Mr. Moylan, to your unexpected legacy: YOU should have died," he wrote. He signed it: "Friends forever, Jarrod W. Ramos."

Ramos also sent a document to Maryland's highest court, and it has been sealed at the request of prosecutors. Wes Adams, Anne Arundel County state's attorney, asked the Court of Appeals to seal the pleading Ramos filed on the day of the shooting. In his motion to seal, Adams wrote: "the pleading creates direct evidence of petitioner's involvement" in the allegations currently under investigation. It was unclear whether the sealed document was the same as the one sent to Moylan.

A spokeswoman for Adams did not immediately return a query seeking comment about the sealed document. Moylan could not be reached for comment Wednesday.

Douglas Colbert, a University of Maryland law professor, described the letters as "very powerful" evidence of intent that the state will make full use of at trial. Colbert said as long as it's established in court Ramos authored the letters, they will be used to show his "planning and deliberate actions" on the day of the attack.

The apparent admissions by the defendant will weaken a defense lawyer's strategy of suggesting he was "suffering from a mental disease or defect" impairing his ability to understand the consequences of his actions, Colbert said.

Ramos, 38, has a well-documented history of harassing the paper's journalists. The defamation suit was thrown out as groundless, and he often railed against current and former Capital staff in profanity-laced tweets. Police found him hiding under a desk after Thursday's attack and jailed him on five counts of first-degree murder.

At a memorial service Monday night for one of those killed, editor Rob Hiassen, Marquardt said he once slept with a baseball bat by his bed because he was so worried about Ramos. He also said they "stepped up security" at the newspaper years ago, and posted Ramos's photo around the office. "But then he went dormant for about two years, and we thought the problem has been solved. Apparently, it was just building up steam," he said.