A football fan tumbled to his death from an elevated walkway outside Candlestick Park, moments after the San Francisco 49ers kicked off their final season home opener at the stadium.
In a separate incident, two people were injured Sunday when a railing collapsed as the Colts played the Raiders in Indianapolis.
In San Francisco, a man who appeared to be in his thirties was walking along the Jamestown Avenue pedestrian walkway, when he fell down onto the sidewalk below shortly before 1:30 p.m. PT (4.30 p.m. ET).
According to NBC Bay Area, multiple witnesses said the man appeared to be intoxicated before he fell.
He was walking with his brother at the time, the San Francisco Chronicle reported.
San Francisco police spokesman Gordon Shyy told the Associated Press that off-duty medics and police officers gave the man first aid until an ambulance arrived, but he was later declared dead.
Bob Lange, a 49ers spokesman, said in a statement that the team had been told of the accident.
"We would like to express our deepest condolences to the family during this difficult time," he said.
Candlestick Park will close at the end of the season, after playing host to the 49ers for 43 years.
It will be turned into a shopping center after the team moves into a new $1.2-billion stadium in Santa Clara.
The death occurred on the same day a railing collapsed at the Colts' game. Two fans who had been leaning against the barrier above the tunnel leading to Oakland's locker room were injured.
Barney Levengood, executive director of the Indiana Convention Center and Lucas Oil Stadium, issued a statement that said one of the people was released after receiving medical attention at the stadium.
AJ Mast / AP photo
Stadium personnel look over the area where two men fell from the stands after a railing gave way as the Oakland Raiders were leaving the field in Indianapolis on Sunday.
The other person was treated at the stadium and transported to Methodist Hospital for additional evaluation. Levengood said that the second fan did not appear to be seriously injured.
Since 2003, there have been more than two dozen cases of fans falling at stadiums across the United States, according to the Institute for the Study of Sports Incidents.
Baseball fan Ronald Lee Homer Jr. died last month after tumbling over Turner Field's fourth-level railing. Homer's death was the third at an Atlanta stadium in the past year.
Broncos fan Noel Robinson was also injured last month when he fell from an escalator at a preseason game in Denver.
The Associated Press contributed to this report.
This story was originally published on Mon Sep 9, 2013 7:00 AM EDT