By CW69 News At 10

ENGLEWOOD, Colo. (CBS4) – Former NFL star Demaryius Thomas was found dead in his Roswell, Ga., home Thursday evening, police there say. He was 33.

“Preliminary information is that his death stems from a medical issue, and our investigators currently have no reason to believe otherwise,” police in the Atlanta suburb said in a statement.

READ MORE: Fulton DA drops charges against man attacked by Alpharetta K9 during an arrest

Police told family members they found Thomas in a shower at his home, according to The Associated Press.

“He had been suffering from seizures for over a year, and we believe he had a seizure when he was showering,” LaTonya Bonseigneur, a first cousin who grew up with Thomas and was so close they considered themselves siblings, told the AP early Friday.

“We’re not sure when he died. We just spoke with him yesterday.”

She added, “He was alone and a friend couldn’t get hold of him, so he called his driver, who has a key because of these seizures, and he went into his home and found him in the shower.”

CBSSports.com’s Cody Benjamin reports that Thomas, who last played in 2019, had only officially announced his retirement in June.

READ MORE: R. Kelly sentenced to 30 years in prison on federal sex trafficking charges

Several Broncos players tweeted emotional responses to the news.

Patrick Smyth, the Denver Broncos chief communications officer, tweeted a statement made by former Broncos Super Bowl champion Peyton Manning:

“D.T. was a better person than he was a player, and he was a Hall of Fame player. That tells you how good of a person he was. He treated my kids like they were his own. He was there for every teammate’s charity event,” Manning shared in a statement. “I texted with D.T. on Tuesday. He was talking about a TD audible we called vs. Arizona in 2014. Absolutely [devastated].”

Thomas, 33, was drafted by the Broncos in the first round of the 2010 draft, leaving the NFL as the Broncos’ second-leading receiver in franchise history. He was selected to five Pro Bowls, won two AFC Championships, and Super Bowl 50. The Broncos celebrated Thomas’ career during the team’s regular-season home opener against the New York Jets, the last team Thomas played for, in September at Empower Field at Mile High.

“Demaryius had an incredible NFL career and was such a big part of everything we accomplished during his many years as a Bronco,” said John Elway, Broncos President of Football Operations, after Thomas announced his retirement. “D.T.” was the complete package as a wide receiver, growing into one of the very best at his position. The combination of his size, speed, strength, and athleticism was unmatched. Demaryius’ remarkable consistency and production were instrumental in our offense setting historic records and our team winning a lot of games, including two AFC Championships and Super Bowl 50.”

Thomas finished his career third in the franchise in receptions (718), second in receiving yards (9,814 yards), first in 100-yard receiving games (36), and second in receiving touchdowns (66). From 2012-15, he had 90 receptions and 1,300 receiving yards each season, joining Pro Football Hall of Famers Marvin Harrison and Jerry Rice as the only players to reach those marks in four consecutive seasons. He was also the third Bronco to make five consecutive Pro Bowls.

MORE NEWS: Judge halts construction of recycling plant in Stonecrest

Two plays ring in the minds of Broncos fans when looking at Thomas’s career. The first was in 2011 when Tim Tebow connected with Thomas on an 80-yard touchdown pass to beat the Pittsburgh Steelers 29-23 in overtime of the AFC Wild Card Game. The second was catching Peyton Manning’s 509th career touchdown pass in 2014, surpassing Brett Farve to set the all-time passing touchdown record.