FORT COLLINS, Colo. -- The fraternity where a 19-year-old Colorado State University student was found dead over the weekend has been suspended by its national headquarters.

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CSU Reacts To Student's Death Hometown Shocked By Star Student's Death

The body of Samantha Spady, a sophomore business major from Beatrice, Neb., was found Sunday evening in an empty lounge at the Sigma Pi fraternity by a member giving a tour of the house. Police suspect drinking contributed to her death although investigators are waiting for the results of toxicology tests.

An autopsy revealed that alcohol was a factor in Spady's death, and a published report said that she had a blood alcohol level of 0.43 percent, five times the legal limit for driving in Colorado.

The fraternity's suspension, pending the results of the investigation, means that there will be no social activities at the house but 18 members can continue living there, Mark Briscoe, national executive director of Brentwood, Tenn.-based Sigma Pi, said Tuesday. He said the suspension was not a punitive measure.

"Nor is it an action where we say our chapter is guilty," Briscoe said. "We're taking control. We want to make sure what's going on."

CSU will also review whether Sigma Pi should remain one of the 19 Greek organizations sanctioned by the school after the investigation is complete, said Anne Hudgens, the school's campus life director.

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CSU Campus Holds Candlelight Vigil For Samantha Spady CSU President Issues Call For Vigilance

Meanwhile, police were still trying to determine how Spady ended up at the fraternity and who gave her access to alcohol, since she's underage.

Police spokeswoman Rita Davis said that Spady was involved in a minor car accident on Saturday and called friends to pick her up. She said the friends indicated she was not drunk at the time, she said.

Davis said there was no sign of foul play, and no signs of sexual assault, leading police to close their criminal investigation into Spady's death. However, charges could be filed if police determined who gave or sold Spady alcohol.

The president of CSU said he will form a task force to study the school's response to alcohol abuse. (Read his letter to CSU community.)

Friends said Spady was very responsible, and that it wasn't like her to drink too much. Medical experts say a woman Spady's size would have to drink about 16 shots in one hour to reach that point. Even for an experienced drinker, that much alcohol can be deadly.

"More experienced drinkers, those with a tolerance built up to alcohol, when they get above a 0.3 or a 0.4, there's a risk of respiratory arrest and death," said Dr. Steve Seifert, with Nebraska Poison Center.

On Tuesday night, about 500 students and staff gathered in the sculpture garden on the Fort Collins campus for a candlelight vigil to remember Spady, described as a bubbly, vivacious woman with natural-born leadership skills. She was an honor student, head varsity cheerleader, homecoming queen, and senior class president before graduating from Beatrice High School in Beatrice, Neb., in 2003.

Spady's death came as a shock to many of her friends and peers, who just began their fall semester.

"We walk very different paths on a daily basis but at the end of the day, we're all family," said student body president Katie Clausen.

"We must be dedicated to take the necessary precautions so that a tragedy like this will never happen again," another student said, crying during the vigil.

Many of those attending the vigil wore the blue ribbons that were passed out on campus, which some students said was in memory of her blue eyes. They held glowing candles and heard songs in tribute to her, including Maroon 5's "She Will Be Loved" and P. Diddy's version of "Every Breath You Take."

Spady's former sorority sister at Chi Omega huddled together and tried to sing a song in memory of her but tears overtook them before they could finish.

School flags will fly at half staff for three days to remember Spady.

Reports show someone was keeping an eye on Spady and thought she had just passed out Saturday night. The Poison Control Center suggests that if someone passes out, someone watching them should check and make sure they can wake up. If they don't respond to a slap in the face, call 911. If the person has any difficulty breathing, they need to go to the hospital. If they're vomiting and seem to be choking on the vomit, it's definitely an emergency situation.

Sigma Pi has been investigated by school officials and police before.

The fraternity was disciplined in March for having a party and a keg at the house. Since 2002, all CSU fraternities and sororities have been banned from having organized drinking parties at their houses and must instead rent a third-party site for such events.

On July 4, 2003 police also responded to Sigma Pi after a man said he was assaulted by six fraternity members, including current president Darren Pettapiece, after he accidentally drove on the fraternity's property. Shawn Guzman was a new city resident who had been driving with his wife and 12-year-old daughter when he said he drove down an alley and ended up on the fraternity's back lawn.

Guzman sued the six members in Larimer County District Court.

Spady's funeral is Friday at 10 a.m. in Beatrice. Watch 7NEWS for more on this developing story.