WASHINGTON – The seemingly quick conclusion that Supreme Court Justice Antonin Scalia died of "natural causes" is prompting calls for an autopsy and toxicological reports.

William Gheen, president of the Americans for Legal Immigration political action committee, noted the media's "rush" to proclaim Scalia's death in a rented room in a resort in Texas as either "natural causes" or heart attack within hours of the discovery of his body Saturday morning.

"Anytime a head of state, member of Congress, or the most conservative member of the U.S. Supreme Court is found dead, an extensive autopsy and toxicology examination should be both immediate and mandatory," said Gheen. "The horrid reaction and comments about his death expressed by many liberals online illustrate that Scalia was hated by many people."

Gheen said Scalia's death "hands the power of the Supreme Court to the modern left for the first time in American history."

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"The court can now vote, even without a replacement of Scalia, to radically change the United States of America," he said. "Scalia's death means the Supreme Court is now very likely to rubber stamp Obama's unconstitutional amnesty orders, tear down Republican drawn districts in many states including North Carolina, and take deep left turns on abortion, gun rights, or anything the liberals have ever dreamed of. Scalia was a solid vote against Obama's immigration orders to be decided by April of this year.

"We do not contend there is a conspiracy, we contend that there should be no doubts, and the way authorities and the media are rushing conclusions will leave major doubts and legitimate concerns about a death that could lead to a radical political transformation of America to the left," said Gheen.

Chris Lujan of Sunset Funeral Homes in El Paso said the body of the late justice arrived early Sunday. Scalia had been staying at the Cibolo Creek Ranch in Presidio County, Texas, during a quail hunting trip, said federal officials. He was 79.

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Presidio County Judge Cinderela Guevara, who pronounced Scalia dead, said the death certificate will say the cause of death was natural and that he died of a heart attack.

She said she decided not to order an autopsy after Sheriff Danny Dominguez concluded there were no signs of foul play, reported WFAA News in Dallas. The Scalia family concurred.

“As part of my investigation, one of the things I did ask the sheriff and the U.S. Marshal: ‘Were there any signs of foul play?’ And they said, ‘absolutely not.’ At that time, I still wanted to be careful, and asked them if [Scalia’s] physician would call me,” Guevara said.

Guevara said she talked to Scalia's doctor in Washington, D.C., who told her he had been sick and had been at his office Wednesday and Thursday before going on the hunting trip Friday.

According to Guevara, Scalia told his group Friday at dinner he was not feeling well and went to his room early. He then missed breakfast and lunch Saturday and was found unresponsive in his bed.

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The owner of the Texas ranch and resort said Scalia died peacefully.

"The judge, when I found him Saturday morning, was in complete repose," John Poindexter, the owner of Cibolo Creek Ranch in Marfa, Texas, told NBC News. "He was very peaceful in his — in the bed. He had obviously passed away with no difficulty at all in the middle of the night."

Scalia, who was appointed to the high court by former President Ronald Reagan, was the longest-serving justice on the court, having taken his seat on Sept. 26, 1986.

The Washington Post reported that after Scalia's body was found:

It then took hours for authorities in remote West Texas to find a justice of the peace, officials said Sunday. When they did, she pronounced Scalia dead of natural causes without seeing the body and decided not to order an autopsy. A second justice of the peace, who was called but couldn't get to Scalia's body in time, said she would have ordered an autopsy. As late as Sunday afternoon, there were conflicting reports about whether an autopsy would be performed, though officials later said Scalia's body was being embalmed and there would be no autopsy. One report, by WFAA-TV in Dallas, said the death certificate would show the cause of the death was a heart attack. As late as Sunday afternoon, for example, there were conflicting reports about whether an autopsy should have been performed. A manager at the El Paso funeral home where Scalia's body was taken said his family made it clear that they did not want one. Meanwhile, Presidio County Judge Cinderela Guevara acknowledged that she pronounced Scalia dead by phone, without seeing his body. Instead, she spoke to law enforcement officials at the scene – who assured her "there were no signs of foul play" – and Scalia's physician in Washington, who said that the 79-year-old justice suffered from a host of chronic conditions. "He was having health issues," Guevara said, adding that she is awaiting a statement from Scalia's doctor that will be added to his death certificate when it is issued later this week. Guevara also rebutted a report by a Dallas TV station that quoted her as saying that Scalia had died of "myocardial infarction." In an interview with The Washington Post, she said she meant only that his heart had stopped. "It wasn't a heart attack," Guevara said. "He died of natural causes."

Despite calls from conservatives for his seat to not be filled until a new president was elected, President Obama said Saturday he intends to nominate a replacement before his term ends.

CBS and the Associated Press report that authorities, including Presidio County Judge Cinderela Guevara, are considering an autopsy, although toxicological testing could already be in doubt due to the delay. There is also a report that after arriving at 3:30 a.m. on Sunday, the Sunset Funeral Home embalmed Scalia's remains, according to Chris Lujuan, a funeral home manager. The embalming process could destroy vital toxicology evidence.

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Gheen is calling on activists to call members of Congress and Presidio County Judge Guevara to demand an immediate and comprehensive investigation into what he calls "the suspiciously timed death of Supreme Court Justice Antonin Scalia that includes extensive multi-agency law enforcement forensic autopsies and toxicology reports to put these questions to rest or determine if foul play was involved."