WASHINGTON >> About 10,000 pages of records related to the 1968 assassination of Sen. Robert F. Kennedy were released Friday, including handwritten notes by the gunman, who said the Democratic presidential candidate “must be disposed of” and acknowledged an obsession with killing him.

Many of the files had been made public previously, while others had not been digitized and sat for decades in federal government storage facilities. Their release continued the disclosure of historical investigation documents ordered by President Donald Trump.

Kennedy was fatally shot on June 5, 1968, at the Ambassador Hotel in Los Angeles moments after giving a speech celebrating his victory in California’s presidential primary. His assassin, Sirhan Sirhan, was convicted of first-degree murder and is serving life in prison.

The files included pictures of handwritten notes by Sirhan.

“RFK must be disposed of like his brother was,” read the writing on the outside of an empty envelope, referring to Kennedy’s older brother, President John F. Kennedy, who was assassinated in 1963. The return address was from the district director of the Internal Revenue Service in Los Angeles.

The National Archives and Records Administration posted 229 files containing the pages to its public website.

The release comes a month after unredacted files related to the assassination of President Kennedy were disclosed. Those documents gave curious readers more details about Cold War-era covert U.S. operations in other nations but did not initially lend credence to long-circulating conspiracy theories about who killed JFK.

Health and Human Services Secretary Robert F. Kennedy Jr., the son of Robert Kennedy, commended the release.

“Lifting the veil on the RFK papers is a necessary step toward restoring trust in American government,” the health secretary said in a statement.

The files surrounding Robert Kennedy’s assassination also included notes from interviews with people who knew Sirhan from a wide variety of contexts, such as classmates, neighbors and coworkers. While some described him as “a friendly, kind and generous person” others depicted a brooding and “impressionable” young man who felt strongly about his political convictions and briefly believed in mysticism.

According to the files, Sirhan told his garbage collector that he planned to kill Kennedy shortly after the Rev. Martin Luther King Jr. was assassinated on April 4, 1968. The sanitation worker, a Black man, said he planned to vote for Kennedy because he would help Black people.

“Well, I don’t agree. I am planning on shooting the son of a bitch,” Sirhan replied, the man told investigators.

Larry Sabato, director of the University of Virginia Center for Politics and author of “The Kennedy Half-Century,” said there have always been conspiracies surrounding Robert Kennedy’s assassination.